Hi. There should be a checklist of everything that can go wrong with making an ssh connection. Here's one entry for the list, which I didn't know before, and * I couldn't see the problem from the -ddd and -vvv output, and * there were no /var/log/* file entries to give hints. Here's what I did sudo kill <pid-of-sshd> /usr/sbin/sshd No good. Usually I did kill -HUP, but once I just killed sshd outright. Gotta start sshd this way: /etc/init.d/sshd start At least on Fedora 11. Below are the observed symptoms. Client side Wed 13:42:40 ip2 yost /Users/yost 254 203 Z% ssh -vvv 192.168.1.33 OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /opt/local/etc/ssh/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to 192.168.1.33 port 22. debug1: Connection established. debug1: identity file /Users/yost/.ssh/identity type -1 debug1: identity file /Users/yost/.ssh/id_rsa type -1 debug3: Not a RSA1 key file /Users/yost/.ssh/id_dsa. debug2: key_type_from_name: unknown key type '-----BEGIN' debug3: key_read: missing keytype debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug2: key_type_from_name: unknown key type '-----END' debug3: key_read: missing keytype debug1: identity file /Users/yost/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2 debug1: match: OpenSSH_5.2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug2: fd 4 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug2: dh_gen_key: priv key bits set: 120/256 debug2: bits set: 538/1024 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug3: check_host_in_hostfile: filename /Users/yost/.ssh/known_hosts debug3: check_host_in_hostfile: match line 38 debug3: check_host_in_hostfile: filename /Users/yost/.ssh/known_hosts debug3: check_host_in_hostfile: match line 39 debug1: Host '192.168.1.33' is known and matches the RSA host key. debug1: Found key in /Users/yost/.ssh/known_hosts:38 debug2: bits set: 502/1024 debug1: ssh_rsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/yost/.ssh/identity (0x0) debug2: key: /Users/yost/.ssh/id_rsa (0x0) debug2: key: /Users/yost/.ssh/id_dsa (0x0) debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug3: start over, passed a different list publickey,gssapi-with-mic,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: /Users/yost/.ssh/identity debug3: no such identity: /Users/yost/.ssh/identity debug1: Trying private key: /Users/yost/.ssh/id_rsa debug3: no such identity: /Users/yost/.ssh/id_rsa debug1: Trying private key: /Users/yost/.ssh/id_dsa debug1: read PEM private key done: type DSA debug3: sign_and_send_pubkey debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password yost at 192.168.1.33's password: debug3: packet_send2: adding 64 (len 60 padlen 4 extra_pad 64) debug2: we sent a password packet, wait for reply debug1: Authentication succeeded (password). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug1: Requesting no-more-sessions at openssh.com debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 1 debug2: channel 0: request shell confirm 1 debug2: fd 4 setting TCP_NODELAY debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel_input_status_confirm: type 99 id 0 debug2: PTY allocation request accepted on channel 0 debug2: channel 0: rcvd adjust 2097152 debug2: channel_input_status_confirm: type 99 id 0 debug2: shell request accepted on channel 0 debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply 0 debug2: channel 0: rcvd eow debug2: channel 0: close_read debug2: channel 0: input open -> closed debug2: channel 0: rcvd eof debug2: channel 0: output open -> drain debug2: channel 0: rcvd close debug3: channel 0: will not send data after close debug3: PAM session not opened, exiting Last login: Wed Jun 3 13:42:40 2009 from 192.168.1.1 debug3: channel 0: will not send data after close debug2: channel 0: obuf empty debug2: channel 0: close_write debug2: channel 0: output drain -> closed debug2: channel 0: almost dead debug2: channel 0: gc: notify user debug2: channel 0: gc: user detached debug2: channel 0: send close debug2: channel 0: is dead debug2: channel 0: garbage collecting debug1: channel 0: free: client-session, nchannels 1 debug3: channel 0: status: The following connections are open: #0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1) debug3: channel 0: close_fds r -1 w -1 e 7 c -1 Connection to 192.168.1.33 closed. Transferred: sent 2208, received 2184 bytes, in 0.1 seconds Bytes per second: sent 29902.9, received 29577.9 debug1: Exit status 254 Wed 13:43:17 ip2 yost /Users/yost 254 204 Z% Server side Wed 13:42:40 192.168.1.33 root /etc 0 45 Z# /usr/sbin/sshd -ddd debug2: load_server_config: filename /etc/ssh/sshd_config debug2: load_server_config: done config len = 728 debug2: parse_server_config: config /etc/ssh/sshd_config len 728 debug3: /etc/ssh/sshd_config:21 setting Protocol 2 debug3: /etc/ssh/sshd_config:36 setting SyslogFacility AUTHPRIV debug3: /etc/ssh/sshd_config:49 setting PubkeyAuthentication yes debug3: /etc/ssh/sshd_config:50 setting AuthorizedKeysFile .ssh/authorized_keys debug3: /etc/ssh/sshd_config:65 setting PasswordAuthentication yes debug3: /etc/ssh/sshd_config:69 setting ChallengeResponseAuthentication no debug3: /etc/ssh/sshd_config:79 setting GSSAPIAuthentication yes debug3: /etc/ssh/sshd_config:81 setting GSSAPICleanupCredentials yes debug3: /etc/ssh/sshd_config:93 setting UsePAM yes debug3: /etc/ssh/sshd_config:96 setting AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES debug3: /etc/ssh/sshd_config:97 setting AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT debug3: /etc/ssh/sshd_config:98 setting AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE debug3: /etc/ssh/sshd_config:104 setting X11Forwarding yes debug3: /etc/ssh/sshd_config:127 setting Subsystem sftp /usr/libexec/openssh/sftp-server debug3: checking syntax for 'Match User rootback' debug3: checking syntax for 'Match User root' debug3: checking syntax for 'Match (null)' debug1: sshd version OpenSSH_5.2p1 debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key. debug1: read PEM private key done: type RSA debug1: private host key: #0 type 1 RSA debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key. debug1: read PEM private key done: type DSA debug1: private host key: #1 type 2 DSA debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-ddd' debug2: fd 3 setting O_NONBLOCK debug1: Bind to port 22 on 0.0.0.0. Server listening on 0.0.0.0 port 22. debug2: fd 4 setting O_NONBLOCK debug1: Bind to port 22 on ::. Server listening on :: port 22. debug3: fd 5 is not O_NONBLOCK debug1: Server will not fork when running in debugging mode. debug3: send_rexec_state: entering fd = 8 config len 728 debug3: ssh_msg_send: type 0 debug3: send_rexec_state: done debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8 debug1: inetd sockets after dupping: 3, 3 Connection from 192.168.1.1 port 47433 debug1: Client protocol version 2.0; client software version OpenSSH_5.2 debug1: match: OpenSSH_5.2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug2: fd 3 setting O_NONBLOCK debug3: privsep user:group 74:74 debug1: permanently_set_uid: 74/74 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: Network child is on pid 430 debug3: preauth child monitor started debug3: mm_request_receive entering debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received debug3: mm_request_send entering: type 0 debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI debug3: mm_request_receive_expect entering: type 1 debug3: mm_request_receive entering debug3: monitor_read: checking request 0 debug3: mm_answer_moduli: got parameters: 1024 1024 8192 debug3: mm_request_send entering: type 1 debug3: mm_choose_dh: remaining 0 debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent debug2: dh_gen_key: priv key bits set: 123/256 debug2: bits set: 502/1024 debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT debug2: monitor_read: 0 used once, disabling now debug3: mm_request_receive entering debug2: bits set: 538/1024 debug3: mm_key_sign entering debug3: mm_request_send entering: type 5 debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN debug3: mm_request_receive_expect entering: type 6 debug3: mm_request_receive entering debug3: monitor_read: checking request 5 debug3: mm_answer_sign debug3: mm_answer_sign: signature 0x7f2a2800e7e0(271) debug3: mm_request_send entering: type 6 debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: monitor_read: 5 used once, disabling now debug3: mm_request_receive entering debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: KEX done debug1: userauth-request for user yost service ssh-connection method none debug1: attempt 0 failures 0 debug3: mm_getpwnamallow entering debug3: mm_request_send entering: type 7 debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM debug3: mm_request_receive_expect entering: type 8 debug3: mm_request_receive entering debug3: monitor_read: checking request 7 debug3: mm_answer_pwnamallow debug3: Trying to reverse map address 192.168.1.1. debug2: parse_server_config: config reprocess config len 728 debug3: checking match for 'User rootback' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match not found debug3: checking match for 'User root' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match not found debug3: checking match for '(null)' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match found debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1 debug3: mm_request_send entering: type 8 debug2: input_userauth_request: setting up authctxt for yost debug3: mm_start_pam entering debug3: mm_request_send entering: type 46 debug3: mm_inform_authserv entering debug3: mm_request_send entering: type 3 debug3: mm_inform_authrole entering debug3: mm_request_send entering: type 4 debug2: input_userauth_request: try method none debug2: monitor_read: 7 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 46 debug1: PAM: initializing for "yost" debug1: PAM: setting PAM_RHOST to "192.168.1.1" debug1: PAM: setting PAM_TTY to "ssh" debug2: monitor_read: 46 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 3 debug3: mm_answer_authserv: service=ssh-connection, styledebug2: monitor_read: 3 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 4 debug3: mm_answer_authrole: roledebug2: monitor_read: 4 used once, disabling now debug3: mm_request_receive entering debug1: userauth-request for user yost service ssh-connection method publickey debug1: attempt 1 failures 0 debug2: input_userauth_request: try method publickey debug3: mm_key_allowed entering debug3: mm_request_send entering: type 21 debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED debug3: mm_request_receive_expect entering: type 22 debug3: mm_request_receive entering debug3: monitor_read: checking request 21 debug3: mm_answer_keyallowed entering debug3: mm_answer_keyallowed: key_from_blob: 0x7f2a28021f10 debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: trying public key file /home/yost/.ssh/authorized_keys debug1: restore_uid: 0/0 debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: trying public key file /home/yost/.ssh/authorized_keys debug1: restore_uid: 0/0 Failed publickey for yost from 192.168.1.1 port 47433 ssh2 debug3: mm_answer_keyallowed: key 0x7f2a28021f10 is not allowed debug3: mm_request_send entering: type 22 debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss debug3: mm_request_receive entering debug1: userauth-request for user yost service ssh-connection method password debug1: attempt 2 failures 1 debug2: input_userauth_request: try method password debug3: mm_auth_password entering debug3: mm_request_send entering: type 11 debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD debug3: mm_request_receive_expect entering: type 12 debug3: mm_request_receive entering debug3: monitor_read: checking request 11 debug3: PAM: sshpam_passwd_conv called with 1 messages debug1: PAM: password authentication accepted for yost debug3: mm_answer_authpassword: sending result 1 debug3: mm_request_send entering: type 12 debug3: mm_auth_password: user authenticated debug3: mm_do_pam_account entering debug3: mm_request_send entering: type 47 debug3: mm_request_receive_expect entering: type 48 debug3: mm_request_receive entering debug3: mm_request_receive_expect entering: type 47 debug3: mm_request_receive entering debug1: do_pam_account: called debug3: PAM: do_pam_account pam_acct_mgmt = 0 (Success) debug3: mm_request_send entering: type 48 debug3: mm_do_pam_account returning 1 debug3: mm_send_keystate: Sending new keys: 0x7f2a280171d0 0x7f2a2800f540 debug3: mm_newkeys_to_blob: converting 0x7f2a280171d0 debug3: mm_newkeys_to_blob: converting 0x7f2a2800f540 debug3: mm_send_keystate: New keys have been sent debug3: mm_send_keystate: Sending compression state debug3: mm_request_send entering: type 25 debug3: mm_send_keystate: Finished sending state Accepted password for yost from 192.168.1.1 port 47433 ssh2 debug1: monitor_child_preauth: yost has been authenticated by privileged process debug3: mm_get_keystate: Waiting for new keys debug3: mm_request_receive_expect entering: type 25 debug3: mm_request_receive entering debug3: mm_newkeys_from_blob: 0x7f2a280233f0(122) debug2: mac_setup: found hmac-md5 debug3: mm_get_keystate: Waiting for second key debug3: mm_newkeys_from_blob: 0x7f2a280233f0(122) debug2: mac_setup: found hmac-md5 debug3: mm_get_keystate: Getting compression state debug3: mm_get_keystate: Getting Network I/O buffers debug3: mm_share_sync: Share sync debug3: mm_share_sync: Share sync end debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: ssh_gssapi_storecreds: Not a GSSAPI mechanism debug1: restore_uid: 0/0 debug1: SELinux support enabled debug3: ssh_selinux_setup_pam_variables: setting execution context debug1: PAM: establishing credentials debug3: PAM: opening session debug3: PAM: sshpam_store_conv called with 1 messages PAM: pam_open_session(): Authentication failure debug1: PAM: establishing credentials debug1: permanently_set_uid: 1008/999 debug2: set_newkeys: mode 0 debug2: set_newkeys: mode 1 debug1: Entering interactive session for SSH2. debug2: fd 6 setting O_NONBLOCK debug2: fd 7 setting O_NONBLOCK debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 debug1: input_session_request debug1: channel 0: new [server-session] debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype no-more-sessions at openssh.com want_reply 0 User child is on pid 433 debug3: mm_request_receive entering debug1: server_input_channel_req: channel 0 request pty-req reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req pty-req debug1: Allocating pty. debug3: mm_request_send entering: type 26 debug3: mm_pty_allocate: waiting for MONITOR_ANS_PTY debug3: mm_request_receive_expect entering: type 27 debug3: mm_request_receive entering debug3: monitor_read: checking request 26 debug3: mm_answer_pty entering debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug3: ssh_selinux_setup_pty: setting TTY context on /dev/pts/2 ssh_selinux_setup_pty: security_compute_relabel: Invalid argument debug3: ssh_selinux_setup_pty: done debug3: mm_request_send entering: type 27 debug1: session_pty_req: session 0 alloc /dev/pts/2 debug1: Ignoring unsupported tty mode opcode 11 (0xb) debug1: Ignoring unsupported tty mode opcode 17 (0x11) debug1: server_input_channel_req: channel 0 request shell reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req shell debug1: Setting controlling tty using TIOCSCTTY. debug3: mm_answer_pty: tty /dev/pts/2 ptyfd 5 debug3: mm_request_receive entering debug2: fd 3 setting TCP_NODELAY debug2: channel 0: rfd 10 isatty debug2: fd 10 setting O_NONBLOCK debug3: fd 8 is O_NONBLOCK debug2: notify_done: reading debug1: Received SIGCHLD. debug1: session_by_pid: pid 434 debug1: session_exit_message: session 0 channel 0 pid 434 debug2: channel 0: request exit-status confirm 0 debug1: session_exit_message: release channel 0 debug2: channel 0: write failed debug2: channel 0: close_write debug2: channel 0: send eow debug2: channel 0: output open -> closed debug3: mm_request_send entering: type 28 debug3: monitor_read: checking request 28 debug3: mm_answer_pty_cleanup entering debug1: session_by_tty: session 0 tty /dev/pts/2 debug3: mm_session_close: session 0 pid 433 debug3: mm_session_close: tty /dev/pts/2 ptyfd 5 debug1: session_pty_cleanup: session 0 release /dev/pts/2 debug3: session_unused: session id 0 unused debug3: mm_request_receive entering debug2: channel 0: read<=0 rfd 10 len -1 debug2: channel 0: read failed debug2: channel 0: close_read debug2: channel 0: input open -> drain debug2: channel 0: ibuf empty debug2: channel 0: send eof debug2: channel 0: input drain -> closed debug2: channel 0: send close debug3: channel 0: will not send data after close debug2: channel 0: rcvd close debug3: channel 0: will not send data after close debug2: channel 0: is dead debug2: channel 0: gc: notify user debug1: session_by_channel: session 0 channel 0 debug1: session_close_by_channel: channel 0 child 0 debug1: session_close: session 0 pid 0 debug3: session_unused: session id 0 unused debug2: channel 0: gc: user detached debug2: channel 0: is dead debug2: channel 0: garbage collecting debug1: channel 0: free: server-session, nchannels 1 debug3: channel 0: status: The following connections are open: #0 server-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1) debug3: channel 0: close_fds r -1 w -1 e -1 c -1 Connection closed by 192.168.1.1 debug1: do_cleanup debug3: PAM: sshpam_thread_cleanup entering Transferred: sent 2184, received 2208 bytes Closing connection to 192.168.1.1 port 47433 debug3: mm_request_send entering: type 59 debug3: monitor_read: checking request 59 debug3: mm_answer_term: tearing down sessions debug1: PAM: cleanup debug1: PAM: deleting credentials Wed 13:43:17 192.168.1.33 root /etc 0 46 Z#
Hi. There should be a checklist of everything that can go wrong with making an ssh connection. Here's one entry for the list, which I didn't know before, and * I couldn't see the problem from the -ddd and -vvv output, and * there were no /var/log/* file entries to give hints. Here's what I did sudo kill <pid-of-sshd> /usr/sbin/sshd No good. Usually I did kill -HUP, but once I just killed sshd outright. Gotta start sshd this way: /etc/init.d/sshd start At least on Fedora 11. Below are the observed symptoms. Client side Wed 13:42:40 ip2 yost /Users/yost 254 203 Z% ssh -vvv 192.168.1.33 OpenSSH_5.2p1, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /opt/local/etc/ssh/ssh_config debug2: ssh_connect: needpriv 0 debug1: Connecting to 192.168.1.33 port 22. debug1: Connection established. debug1: identity file /Users/yost/.ssh/identity type -1 debug1: identity file /Users/yost/.ssh/id_rsa type -1 debug3: Not a RSA1 key file /Users/yost/.ssh/id_dsa. debug2: key_type_from_name: unknown key type '-----BEGIN' debug3: key_read: missing keytype debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug2: key_type_from_name: unknown key type '-----END' debug3: key_read: missing keytype debug1: identity file /Users/yost/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2 debug1: match: OpenSSH_5.2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug2: fd 4 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug2: dh_gen_key: priv key bits set: 120/256 debug2: bits set: 538/1024 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug3: check_host_in_hostfile: filename /Users/yost/.ssh/known_hosts debug3: check_host_in_hostfile: match line 38 debug3: check_host_in_hostfile: filename /Users/yost/.ssh/known_hosts debug3: check_host_in_hostfile: match line 39 debug1: Host '192.168.1.33' is known and matches the RSA host key. debug1: Found key in /Users/yost/.ssh/known_hosts:38 debug2: bits set: 502/1024 debug1: ssh_rsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /Users/yost/.ssh/identity (0x0) debug2: key: /Users/yost/.ssh/id_rsa (0x0) debug2: key: /Users/yost/.ssh/id_dsa (0x0) debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug3: start over, passed a different list publickey,gssapi-with-mic,password debug3: preferred publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: /Users/yost/.ssh/identity debug3: no such identity: /Users/yost/.ssh/identity debug1: Trying private key: /Users/yost/.ssh/id_rsa debug3: no such identity: /Users/yost/.ssh/id_rsa debug1: Trying private key: /Users/yost/.ssh/id_dsa debug1: read PEM private key done: type DSA debug3: sign_and_send_pubkey debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password yost at 192.168.1.33's password: debug3: packet_send2: adding 64 (len 60 padlen 4 extra_pad 64) debug2: we sent a password packet, wait for reply debug1: Authentication succeeded (password). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug1: Requesting no-more-sessions at openssh.com debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 1 debug2: channel 0: request shell confirm 1 debug2: fd 4 setting TCP_NODELAY debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel_input_status_confirm: type 99 id 0 debug2: PTY allocation request accepted on channel 0 debug2: channel 0: rcvd adjust 2097152 debug2: channel_input_status_confirm: type 99 id 0 debug2: shell request accepted on channel 0 debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype eow at openssh.com reply 0 debug2: channel 0: rcvd eow debug2: channel 0: close_read debug2: channel 0: input open -> closed debug2: channel 0: rcvd eof debug2: channel 0: output open -> drain debug2: channel 0: rcvd close debug3: channel 0: will not send data after close debug3: PAM session not opened, exiting Last login: Wed Jun 3 13:42:40 2009 from 192.168.1.1 debug3: channel 0: will not send data after close debug2: channel 0: obuf empty debug2: channel 0: close_write debug2: channel 0: output drain -> closed debug2: channel 0: almost dead debug2: channel 0: gc: notify user debug2: channel 0: gc: user detached debug2: channel 0: send close debug2: channel 0: is dead debug2: channel 0: garbage collecting debug1: channel 0: free: client-session, nchannels 1 debug3: channel 0: status: The following connections are open: #0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1) debug3: channel 0: close_fds r -1 w -1 e 7 c -1 Connection to 192.168.1.33 closed. Transferred: sent 2208, received 2184 bytes, in 0.1 seconds Bytes per second: sent 29902.9, received 29577.9 debug1: Exit status 254 Wed 13:43:17 ip2 yost /Users/yost 254 204 Z% Server side Wed 13:42:40 192.168.1.33 root /etc 0 45 Z# /usr/sbin/sshd -ddd debug2: load_server_config: filename /etc/ssh/sshd_config debug2: load_server_config: done config len = 728 debug2: parse_server_config: config /etc/ssh/sshd_config len 728 debug3: /etc/ssh/sshd_config:21 setting Protocol 2 debug3: /etc/ssh/sshd_config:36 setting SyslogFacility AUTHPRIV debug3: /etc/ssh/sshd_config:49 setting PubkeyAuthentication yes debug3: /etc/ssh/sshd_config:50 setting AuthorizedKeysFile .ssh/authorized_keys debug3: /etc/ssh/sshd_config:65 setting PasswordAuthentication yes debug3: /etc/ssh/sshd_config:69 setting ChallengeResponseAuthentication no debug3: /etc/ssh/sshd_config:79 setting GSSAPIAuthentication yes debug3: /etc/ssh/sshd_config:81 setting GSSAPICleanupCredentials yes debug3: /etc/ssh/sshd_config:93 setting UsePAM yes debug3: /etc/ssh/sshd_config:96 setting AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES debug3: /etc/ssh/sshd_config:97 setting AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT debug3: /etc/ssh/sshd_config:98 setting AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE debug3: /etc/ssh/sshd_config:104 setting X11Forwarding yes debug3: /etc/ssh/sshd_config:127 setting Subsystem sftp /usr/libexec/openssh/sftp-server debug3: checking syntax for 'Match User rootback' debug3: checking syntax for 'Match User root' debug3: checking syntax for 'Match (null)' debug1: sshd version OpenSSH_5.2p1 debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key. debug1: read PEM private key done: type RSA debug1: private host key: #0 type 1 RSA debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key. debug1: read PEM private key done: type DSA debug1: private host key: #1 type 2 DSA debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-ddd' debug2: fd 3 setting O_NONBLOCK debug1: Bind to port 22 on 0.0.0.0. Server listening on 0.0.0.0 port 22. debug2: fd 4 setting O_NONBLOCK debug1: Bind to port 22 on ::. Server listening on :: port 22. debug3: fd 5 is not O_NONBLOCK debug1: Server will not fork when running in debugging mode. debug3: send_rexec_state: entering fd = 8 config len 728 debug3: ssh_msg_send: type 0 debug3: send_rexec_state: done debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8 debug1: inetd sockets after dupping: 3, 3 Connection from 192.168.1.1 port 47433 debug1: Client protocol version 2.0; client software version OpenSSH_5.2 debug1: match: OpenSSH_5.2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.2 debug2: fd 3 setting O_NONBLOCK debug3: privsep user:group 74:74 debug1: permanently_set_uid: 74/74 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: none,zlib at openssh.com debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc at lysator.liu.se debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: Network child is on pid 430 debug3: preauth child monitor started debug3: mm_request_receive entering debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received debug3: mm_request_send entering: type 0 debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI debug3: mm_request_receive_expect entering: type 1 debug3: mm_request_receive entering debug3: monitor_read: checking request 0 debug3: mm_answer_moduli: got parameters: 1024 1024 8192 debug3: mm_request_send entering: type 1 debug3: mm_choose_dh: remaining 0 debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent debug2: dh_gen_key: priv key bits set: 123/256 debug2: bits set: 502/1024 debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT debug2: monitor_read: 0 used once, disabling now debug3: mm_request_receive entering debug2: bits set: 538/1024 debug3: mm_key_sign entering debug3: mm_request_send entering: type 5 debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN debug3: mm_request_receive_expect entering: type 6 debug3: mm_request_receive entering debug3: monitor_read: checking request 5 debug3: mm_answer_sign debug3: mm_answer_sign: signature 0x7f2a2800e7e0(271) debug3: mm_request_send entering: type 6 debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: monitor_read: 5 used once, disabling now debug3: mm_request_receive entering debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: KEX done debug1: userauth-request for user yost service ssh-connection method none debug1: attempt 0 failures 0 debug3: mm_getpwnamallow entering debug3: mm_request_send entering: type 7 debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM debug3: mm_request_receive_expect entering: type 8 debug3: mm_request_receive entering debug3: monitor_read: checking request 7 debug3: mm_answer_pwnamallow debug3: Trying to reverse map address 192.168.1.1. debug2: parse_server_config: config reprocess config len 728 debug3: checking match for 'User rootback' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match not found debug3: checking match for 'User root' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match not found debug3: checking match for '(null)' user yost host 192.168.1.1 addr 192.168.1.1 debug3: match found debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1 debug3: mm_request_send entering: type 8 debug2: input_userauth_request: setting up authctxt for yost debug3: mm_start_pam entering debug3: mm_request_send entering: type 46 debug3: mm_inform_authserv entering debug3: mm_request_send entering: type 3 debug3: mm_inform_authrole entering debug3: mm_request_send entering: type 4 debug2: input_userauth_request: try method none debug2: monitor_read: 7 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 46 debug1: PAM: initializing for "yost" debug1: PAM: setting PAM_RHOST to "192.168.1.1" debug1: PAM: setting PAM_TTY to "ssh" debug2: monitor_read: 46 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 3 debug3: mm_answer_authserv: service=ssh-connection, styledebug2: monitor_read: 3 used once, disabling now debug3: mm_request_receive entering debug3: monitor_read: checking request 4 debug3: mm_answer_authrole: roledebug2: monitor_read: 4 used once, disabling now debug3: mm_request_receive entering debug1: userauth-request for user yost service ssh-connection method publickey debug1: attempt 1 failures 0 debug2: input_userauth_request: try method publickey debug3: mm_key_allowed entering debug3: mm_request_send entering: type 21 debug3: mm_key_allowed: waiting for MONITOR_ANS_KEYALLOWED debug3: mm_request_receive_expect entering: type 22 debug3: mm_request_receive entering debug3: monitor_read: checking request 21 debug3: mm_answer_keyallowed entering debug3: mm_answer_keyallowed: key_from_blob: 0x7f2a28021f10 debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: trying public key file /home/yost/.ssh/authorized_keys debug1: restore_uid: 0/0 debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: trying public key file /home/yost/.ssh/authorized_keys debug1: restore_uid: 0/0 Failed publickey for yost from 192.168.1.1 port 47433 ssh2 debug3: mm_answer_keyallowed: key 0x7f2a28021f10 is not allowed debug3: mm_request_send entering: type 22 debug2: userauth_pubkey: authenticated 0 pkalg ssh-dss debug3: mm_request_receive entering debug1: userauth-request for user yost service ssh-connection method password debug1: attempt 2 failures 1 debug2: input_userauth_request: try method password debug3: mm_auth_password entering debug3: mm_request_send entering: type 11 debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD debug3: mm_request_receive_expect entering: type 12 debug3: mm_request_receive entering debug3: monitor_read: checking request 11 debug3: PAM: sshpam_passwd_conv called with 1 messages debug1: PAM: password authentication accepted for yost debug3: mm_answer_authpassword: sending result 1 debug3: mm_request_send entering: type 12 debug3: mm_auth_password: user authenticated debug3: mm_do_pam_account entering debug3: mm_request_send entering: type 47 debug3: mm_request_receive_expect entering: type 48 debug3: mm_request_receive entering debug3: mm_request_receive_expect entering: type 47 debug3: mm_request_receive entering debug1: do_pam_account: called debug3: PAM: do_pam_account pam_acct_mgmt = 0 (Success) debug3: mm_request_send entering: type 48 debug3: mm_do_pam_account returning 1 debug3: mm_send_keystate: Sending new keys: 0x7f2a280171d0 0x7f2a2800f540 debug3: mm_newkeys_to_blob: converting 0x7f2a280171d0 debug3: mm_newkeys_to_blob: converting 0x7f2a2800f540 debug3: mm_send_keystate: New keys have been sent debug3: mm_send_keystate: Sending compression state debug3: mm_request_send entering: type 25 debug3: mm_send_keystate: Finished sending state Accepted password for yost from 192.168.1.1 port 47433 ssh2 debug1: monitor_child_preauth: yost has been authenticated by privileged process debug3: mm_get_keystate: Waiting for new keys debug3: mm_request_receive_expect entering: type 25 debug3: mm_request_receive entering debug3: mm_newkeys_from_blob: 0x7f2a280233f0(122) debug2: mac_setup: found hmac-md5 debug3: mm_get_keystate: Waiting for second key debug3: mm_newkeys_from_blob: 0x7f2a280233f0(122) debug2: mac_setup: found hmac-md5 debug3: mm_get_keystate: Getting compression state debug3: mm_get_keystate: Getting Network I/O buffers debug3: mm_share_sync: Share sync debug3: mm_share_sync: Share sync end debug1: temporarily_use_uid: 1008/999 (e=0/0) debug1: ssh_gssapi_storecreds: Not a GSSAPI mechanism debug1: restore_uid: 0/0 debug1: SELinux support enabled debug3: ssh_selinux_setup_pam_variables: setting execution context debug1: PAM: establishing credentials debug3: PAM: opening session debug3: PAM: sshpam_store_conv called with 1 messages PAM: pam_open_session(): Authentication failure debug1: PAM: establishing credentials debug1: permanently_set_uid: 1008/999 debug2: set_newkeys: mode 0 debug2: set_newkeys: mode 1 debug1: Entering interactive session for SSH2. debug2: fd 6 setting O_NONBLOCK debug2: fd 7 setting O_NONBLOCK debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 debug1: input_session_request debug1: channel 0: new [server-session] debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype no-more-sessions at openssh.com want_reply 0 User child is on pid 433 debug3: mm_request_receive entering debug1: server_input_channel_req: channel 0 request pty-req reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req pty-req debug1: Allocating pty. debug3: mm_request_send entering: type 26 debug3: mm_pty_allocate: waiting for MONITOR_ANS_PTY debug3: mm_request_receive_expect entering: type 27 debug3: mm_request_receive entering debug3: monitor_read: checking request 26 debug3: mm_answer_pty entering debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug3: ssh_selinux_setup_pty: setting TTY context on /dev/pts/2 ssh_selinux_setup_pty: security_compute_relabel: Invalid argument debug3: ssh_selinux_setup_pty: done debug3: mm_request_send entering: type 27 debug1: session_pty_req: session 0 alloc /dev/pts/2 debug1: Ignoring unsupported tty mode opcode 11 (0xb) debug1: Ignoring unsupported tty mode opcode 17 (0x11) debug1: server_input_channel_req: channel 0 request shell reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req shell debug1: Setting controlling tty using TIOCSCTTY. debug3: mm_answer_pty: tty /dev/pts/2 ptyfd 5 debug3: mm_request_receive entering debug2: fd 3 setting TCP_NODELAY debug2: channel 0: rfd 10 isatty debug2: fd 10 setting O_NONBLOCK debug3: fd 8 is O_NONBLOCK debug2: notify_done: reading debug1: Received SIGCHLD. debug1: session_by_pid: pid 434 debug1: session_exit_message: session 0 channel 0 pid 434 debug2: channel 0: request exit-status confirm 0 debug1: session_exit_message: release channel 0 debug2: channel 0: write failed debug2: channel 0: close_write debug2: channel 0: send eow debug2: channel 0: output open -> closed debug3: mm_request_send entering: type 28 debug3: monitor_read: checking request 28 debug3: mm_answer_pty_cleanup entering debug1: session_by_tty: session 0 tty /dev/pts/2 debug3: mm_session_close: session 0 pid 433 debug3: mm_session_close: tty /dev/pts/2 ptyfd 5 debug1: session_pty_cleanup: session 0 release /dev/pts/2 debug3: session_unused: session id 0 unused debug3: mm_request_receive entering debug2: channel 0: read<=0 rfd 10 len -1 debug2: channel 0: read failed debug2: channel 0: close_read debug2: channel 0: input open -> drain debug2: channel 0: ibuf empty debug2: channel 0: send eof debug2: channel 0: input drain -> closed debug2: channel 0: send close debug3: channel 0: will not send data after close debug2: channel 0: rcvd close debug3: channel 0: will not send data after close debug2: channel 0: is dead debug2: channel 0: gc: notify user debug1: session_by_channel: session 0 channel 0 debug1: session_close_by_channel: channel 0 child 0 debug1: session_close: session 0 pid 0 debug3: session_unused: session id 0 unused debug2: channel 0: gc: user detached debug2: channel 0: is dead debug2: channel 0: garbage collecting debug1: channel 0: free: server-session, nchannels 1 debug3: channel 0: status: The following connections are open: #0 server-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1) debug3: channel 0: close_fds r -1 w -1 e -1 c -1 Connection closed by 192.168.1.1 debug1: do_cleanup debug3: PAM: sshpam_thread_cleanup entering Transferred: sent 2184, received 2208 bytes Closing connection to 192.168.1.1 port 47433 debug3: mm_request_send entering: type 59 debug3: monitor_read: checking request 59 debug3: mm_answer_term: tearing down sessions debug1: PAM: cleanup debug1: PAM: deleting credentials Wed 13:43:17 192.168.1.33 root /etc 0 46 Z#
On 2009-06-05 02:04, Dave Yost wrote:
: There should be a checklist of everything that can go wrong with
: making an ssh connection.
:
: Here's one entry for the list, which I didn't know before, and
: * I couldn't see the problem from the -ddd and -vvv output, and
: * there were no /var/log/* file entries to give hints.
:
: Here's what I did
: sudo kill <pid-of-sshd>
: /usr/sbin/sshd
Surely that should at least be 'sudo /usr/sbin/sshd', so that sshd has
privileges to listen on low-numbered ports and change UID, but see
below.
: No good.
:
: Usually I did kill -HUP, but once I just killed sshd outright.
:
: Gotta start sshd this way:
: /etc/init.d/sshd start
:
: At least on Fedora 11.
[...]
Recent Fedoras, as well as RHEL v5 and CentOS v5, often have SELinux
enabled, which requires that security contexts are set up properly. The
initscript will do that, but merely running sshd from the command won't.
Also, Fedora/RedHat and cousins have /sbin/service which does a little
bit more to set up an environment for daemons to run in (e.g., 'cd /'
and clearing some environment). Best is (as root):
/sbin/service sshd start
on those platforms.
--
jim knoble | jmknoble at pobox.com | http://www.pobox.com/~jmknoble/
(GnuPG key ID: C6F31FFA >>>>>>
http://www.pobox.com/~jmknoble/keys/ )
(GnuPG fingerprint: 99D8:1D89:8C66:08B5:5C34::5527:A543:8C33:C6F3:1FFA)
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