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Garret Huntress

2007-Feb-27 19:13 UTC

[Dovecot] Dovecot rc23 and rc24 freeze after authentication

I had our production systems running on rc23, however we ran into  
problems when the server was under heavy load.  Eventually, the  
server would begin to freeze all imap connection after authentication  
(according to the logs).  A user would connect, authentication would  
succeed, and then the connection would sit until timing out.  No  
error logs were produced.  Upgrading to rc24 did not resolve the  
issue, but reverting to rc22 has.

-Garret
-- 
Garret W. Huntress
System Administrator / System Developer

Geophysical Laboratory
Carnegie Institution of Washington
5251 Broad Branch Road, NW
Washington, DC 20015

Email: ghuntress at ciw.edu
Phone: (202)-478-8973
AIM: Garret Huntress


?

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Charles Marcus

2007-Feb-27 20:15 UTC

head link

[Dovecot] Dovecot rc23 and rc24 freeze after authentication

Garret Huntress wrote:> I had our production systems running on rc23, however we ran into 
> problems when the server was under heavy load.  Eventually, the server 
> would begin to freeze all imap connection after authentication 
> (according to the logs).  A user would connect, authentication would 
> succeed, and then the connection would sit until timing out.  No error 
> logs were produced.  Upgrading to rc24 did not resolve the issue, but 
> reverting to rc22 has.
Ok, give me a sec....

<grunt> <grunt>

Dang - sorry, my crystall ball just isn't working... so, it may be just 
a leetle bit helpful if you provided some details... I'm thinking maybe 
some dovecot -n output, actual logs (well, you did say you had looked at 
them), platform, etc...

-- 

Best regards,

Charles

Garret Huntress

2007-Feb-28 04:56 UTC

head link

[Dovecot] Dovecot rc23 and rc24 freeze after authentication

Machine: Quad 2GHz Opterons, 8GB Mem


OS: Fedora Core 5 (Linux mail1.ciw.edu 2.6.17-1.2187_FC5 #1 SMP Mon  
Sep 11 01:16:59 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux)


Output from dovecot -n (now in rc22):
# /etc/dovecot.conf
base_dir: /srv/Apps/dovecot/
log_path: /var/log/dovecot/dovecot.log
protocols: imap imaps pop3s
ssl_ca_file: /etc/pki/tls/certs/ciw.edu-ca_cert.pem
ssl_cert_file: /etc/pki/tls/certs/mail.ciw.edu-cert.pem
ssl_key_file: /etc/pki/tls/private/mail.ciw.edu-key.pem
login_dir: /srv/Apps/dovecot/login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
login_max_processes_count: 1024
default_mail_env: maildir:%h/Maildir
mail_location: maildir:%h/Maildir
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_plugins: acl
mail_plugin_dir(default): /usr/lib64/dovecot/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3
imap_client_workarounds(default): delay-newmail outlook-idle
imap_client_workarounds(imap): delay-newmail outlook-idle
imap_client_workarounds(pop3): outlook-idle
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
namespace:
   type: private
   separator: /
   location: maildir:%h/Maildir
   inbox: yes
namespace:
   type: private
   separator: /
   prefix: CIW Archived/
   location: maildir:%h/Mailarchive
namespace:
   type: public
   separator: /
   prefix: CIW Groups/
   location: maildir:/srv/Export/Groups:CONTROL=%h/Maildir/public- 
subscriptions:INDEX=%h/Maildir/public-index
auth default:
   passdb:
     driver: pam
     args: session=yes dovecot
   userdb:
     driver: passwd


cat of /etc/pam.d/dovecot
#%PAM-1.0
auth       required     pam_nologin.so
auth       include      od-auth
account    include      od-auth
session    include      od-auth


cat of /etc/pam.d/od-auth
#%PAM-1.0
auth        required      pam_env.so
auth        sufficient    pam_krb5.so
auth        required      pam_deny.so

account     required      pam_ldap.so

session     optional      pam_mkhomedir.so skel=/etc/skel umask=077
session     required      pam_limits.so
session     required      pam_krb5.so
session     required      pam_ldap.so


Logs from when it occurred (usernames modified)
dovecot: Feb 26 11:50:15 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:50:16 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:50:16 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:50:16 Info: imap-login: Disconnected:  
rip=10.1.1.254, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:50:16 Info: IMAP(user2): Disconnected: Logged out
dovecot: Feb 26 11:50:16 Info: imap-login: Login: user=<user3>,  
method=PLAIN, rip=10.1.20.232, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:17 Info: imap-login: Login: user=<user4>,  
method=PLAIN, rip=10.1.20.253, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:17 Info: imap-login: Disconnected:  
rip=10.1.20.233, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:50:19 Info: imap-login: Login: user=<user5>,  
method=PLAIN, rip=4.21.98.3, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:20 Info: imap-login: Disconnected: Shutting  
down: method=PLAIN, rip=10.1.15.194, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:21 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:45 Info: IMAP(user6): Disconnected: Logged out
dovecot: Feb 26 11:50:46 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:53 Info: IMAP(user7): Disconnected: Logged out
dovecot: Feb 26 11:50:53 Info: imap-login: Disconnected:  
rip=10.1.15.170, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:50:54 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:50:57 Info: IMAP(user3): Disconnected: Logged out
dovecot: Feb 26 11:50:57 Info: imap-login: Login: user=<user8>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:50:57 Info: IMAP(user8): Disconnected
dovecot: Feb 26 11:50:58 Info: imap-login: Login: user=<user9>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:50:58 Info: IMAP(user9): Disconnected
dovecot: Feb 26 11:50:59 Info: imap-login: Login: user=<user10>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:50:59 Info: IMAP(user10): Disconnected
dovecot: Feb 26 11:51:00 Info: imap-login: Login: user=<user11>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:00 Info: IMAP(user11): Disconnected
dovecot: Feb 26 11:51:01 Info: imap-login: Login: user=<user12>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:01 Info: IMAP(user12): Disconnected
dovecot: Feb 26 11:51:02 Info: imap-login: Login: user=<user13>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:02 Info: IMAP(user13): Disconnected
dovecot: Feb 26 11:51:03 Info: imap-login: Login: user=<user14>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:03 Info: IMAP(user14): Disconnected
dovecot: Feb 26 11:51:04 Info: imap-login: Login: user=<user15>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:04 Info: IMAP(user15): Disconnected
dovecot: Feb 26 11:51:05 Info: imap-login: Login: user=<user16>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:05 Info: IMAP(user16): Disconnected
dovecot: Feb 26 11:51:06 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:06 Info: IMAP(user17): Disconnected: Logged out
dovecot: Feb 26 11:51:07 Info: imap-login: Login: user=<user16>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:08 Info: imap-login: Login: user=<user9>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:08 Info: IMAP(user9): Disconnected
dovecot: Feb 26 11:51:09 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:09 Info: IMAP(user17): Disconnected: Logged out
dovecot: Feb 26 11:51:10 Info: IMAP(user18): Disconnected: Logged out
dovecot: Feb 26 11:51:10 Info: imap-login: Login: user=<user10>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:10 Info: imap-login: Login: user=<user8>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:10 Info: IMAP(user8): Disconnected: Logged out
dovecot: Feb 26 11:51:11 Info: IMAP(user10): Disconnected: Logged out
dovecot: Feb 26 11:51:11 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:11 Info: imap-login: Login: user=<user19>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:11 Info: IMAP(user19): Disconnected: Logged out
dovecot: Feb 26 11:51:12 Info: IMAP(user17): Disconnected
dovecot: Feb 26 11:51:12 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:12 Info: imap-login: Login: user=<user9>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:12 Info: IMAP(user17): Disconnected: Logged out
dovecot: Feb 26 11:51:13 Info: imap-login: Login: user=<user19>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:13 Info: imap-login: Login: user=<user8>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:14 Info: IMAP(user19): Disconnected: Logged out
dovecot: Feb 26 11:51:14 Info: IMAP(user8): Disconnected: Logged out
dovecot: Feb 26 11:51:14 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:14 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:15 Info: IMAP(user17): Disconnected: Logged out
dovecot: Feb 26 11:51:15 Info: IMAP(user17): Disconnected
dovecot: Feb 26 11:51:15 Info: imap-login: Login: user=<user19>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:15 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:15 Info: IMAP(user17): Disconnected
dovecot: Feb 26 11:51:16 Info: IMAP(user19): Disconnected: Logged out
dovecot: Feb 26 11:51:16 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:16 Info: imap-login: Login: user=<user15>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:16 Info: IMAP(user17): Disconnected
dovecot: Feb 26 11:51:16 Info: IMAP(user15): Disconnected: Logged out
dovecot: Feb 26 11:51:17 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:17 Info: IMAP(user17): Disconnected
dovecot: Feb 26 11:51:21 Info: imap-login: Login: user=<user12>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:21 Info: IMAP(user12): Disconnected: Logged out
dovecot: Feb 26 11:51:21 Info: imap-login: Login: user=<user17>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:21 Info: IMAP(user17): Disconnected: Logged out
dovecot: Feb 26 11:51:22 Info: imap-login: Login: user=<user12>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:22 Info: IMAP(user12): Disconnected: Logged out
dovecot: Feb 26 11:51:22 Info: imap-login: Login: user=<user12>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:23 Info: IMAP(user12): Disconnected: Logged out
dovecot: Feb 26 11:51:31 Info: imap-login: Login: user=<user15>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:31 Info: IMAP(user15): Disconnected: Logged out
dovecot: Feb 26 11:51:31 Info: imap-login: Login: user=<user15>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:31 Info: IMAP(user15): Disconnected: Logged out
dovecot: Feb 26 11:51:53 Info: imap-login: Login: user=<user20>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:51:54 Info: IMAP(user20): Disconnected: Logged out
dovecot: Feb 26 11:51:59 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:52:01 Info: imap-login: Login: user=<user21>,  
method=PLAIN, rip=129.49.95.41, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:07 Info: IMAP(user16): Disconnected
dovecot: Feb 26 11:53:08 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:53:08 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:53:08 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:53:08 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:53:08 Info: imap-login: Disconnected:  
rip=10.1.20.233, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:53:08 Info: imap-login: Disconnected:  
rip=10.1.1.254, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:53:08 Info: imap-login: Disconnected:  
rip=10.1.15.170, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:53:08 Info: imap-login: Login: user=<user21>,  
method=PLAIN, rip=129.49.95.41, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:09 Info: imap-login: Login: user=<user22>,  
method=PLAIN, rip=10.1.15.187, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:09 Info: imap-login: Login: user=<user23>,  
method=PLAIN, rip=10.1.15.170, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:10 Info: imap-login: Login: user=<user24>,  
method=PLAIN, rip=68.8.68.149, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:12 Info: IMAP(user9): Disconnected
dovecot: Feb 26 11:53:29 Info: IMAP(user25): Disconnected: Logged out
dovecot: Feb 26 11:53:29 Info: imap-login: Login: user=<user26>,  
method=PLAIN, rip=216.9.249.213, lip=10.1.248.31, TLS
dovecot: Feb 26 11:53:30 Info: IMAP(user26): Disconnected: Logged out
dovecot: Feb 26 11:53:31 Info: imap-login: Login: user=<user24>,  
method=PLAIN, rip=68.8.68.149, lip=10.1.248.31, TLS
dovecot: Feb 26 11:54:40 Info: IMAP(user27): Disconnected: Logged out
dovecot: Feb 26 11:54:40 Info: IMAP(user27): Disconnected: Logged out
dovecot: Feb 26 11:54:41 Info: imap-login: Disconnected:  
rip=10.1.15.156, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:54:41 Info: imap-login: Disconnected:  
rip=10.1.15.170, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:54:42 Info: imap-login: Login: user=<user28>,  
method=PLAIN, rip=10.1.2.21, lip=10.1.248.31, TLS
dovecot: Feb 26 11:54:43 Info: imap-login: Disconnected: Shutting  
down: rip=10.1.15.207, lip=10.1.248.31, TLS
dovecot: Feb 26 11:54:44 Info: imap-login: Login: user=<user22>,  
method=PLAIN, rip=10.1.15.187, lip=10.1.248.31, TLS
dovecot: Feb 26 11:54:44 Info: IMAP(user22): Disconnected: Logged out
dovecot: Feb 26 11:54:45 Info: imap-login: Login: user=<user29>,  
method=PLAIN, rip=10.1.15.147, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:42 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:55:42 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:55:42 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:55:43 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:55:43 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:55:43 Info: imap-login: Disconnected:  
rip=10.1.20.232, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:55:43 Info: imap-login: Disconnected:  
rip=10.1.2.21, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:55:43 Info: imap-login: Login: user=<user29>,  
method=PLAIN, rip=10.1.15.147, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:43 Info: imap-login: Login: user=<user6>,  
method=PLAIN, rip=10.1.20.128, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:43 Info: imap-login: Login: user=<user16>,  
method=PLAIN, rip=10.1.15.207, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:44 Info: imap-login: Login: user=<user29>,  
method=PLAIN, rip=10.1.15.147, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:44 Info: imap-login: Disconnected:  
rip=10.1.20.233, lip=10.1.248.31, TLS
dovecot: Feb 26 11:55:45 Info: imap-login: Login: user=<user18>,  
method=PLAIN, rip=10.1.15.142, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:45 Info: IMAP(user29): Disconnected: Logged out
dovecot: Feb 26 11:56:45 Info: IMAP(user29): Disconnected: Logged out
dovecot: Feb 26 11:56:45 Info: IMAP(user29): Disconnected: Logged out
dovecot: Feb 26 11:56:45 Info: imap-login: Disconnected:  
rip=10.1.15.147, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:56:45 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:45 Info: imap-login: Login: user=<user18>,  
method=PLAIN, rip=10.1.15.142, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:45 Info: IMAP(user18): Disconnected: Logged out
dovecot: Feb 26 11:56:46 Info: imap-login: Disconnected:  
rip=10.1.2.21, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:56:46 Info: imap-login: Disconnected:  
rip=10.1.2.21, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:56:47 Info: IMAP(user30): Disconnected for inactivity
dovecot: Feb 26 11:56:47 Info: imap-login: Disconnected:  
rip=10.1.2.21, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:56:47 Info: imap-login: Disconnected:  
rip=10.1.2.21, lip=10.1.248.31, TLS handshake
dovecot: Feb 26 11:56:48 Info: imap-login: Login: user=<user31>,  
method=PLAIN, rip=160.111.107.74, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:48 Info: imap-login: Login: user=<user1>,  
method=PLAIN, rip=10.1.1.254, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:48 Info: imap-login: Login: user=<user32>,  
method=PLAIN, rip=10.1.15.139, lip=10.1.248.31, TLS
dovecot: Feb 26 11:56:52 Info: IMAP(user1): Disconnected: Logged out
dovecot: Feb 26 11:56:53 Info: imap-login: Login: user=<user28>,  
method=PLAIN, rip=10.1.2.21, lip=10.1.248.31, TLS
dovecot: Feb 26 11:57:04 Info: IMAP(user28): Disconnected: Logged out
dovecot: Feb 26 11:57:04 Info: imap-login: Login: user=<user12>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:57:04 Info: IMAP(user12): Disconnected
dovecot: Feb 26 11:57:05 Info: imap-login: Login: user=<user33>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:57:05 Info: IMAP(user33): Disconnected
dovecot: Feb 26 11:57:06 Info: imap-login: Login: user=<user16>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:57:06 Info: IMAP(user16): Disconnected
dovecot: Feb 26 11:57:07 Info: imap-login: Login: user=<user34>,  
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
dovecot: Feb 26 11:57:07 Info: IMAP(user34): Disconnected
dovecot: Feb 26 11:57:09 Info: imap-login: Login: user=<user35>,  
method=PLAIN, rip=10.1.15.136, lip=10.1.248.31, TLS
dovecot: Feb 26 11:57:21 Warning: Killed with signal 15
dovecot: Feb 26 11:57:21 Info: Dovecot v1.0.rc23 starting upuser1

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