Hi everyone, this one is giving me headaches for a while now and I could not get anything useful from the usual sources. So maybe someone on this list can give me any ideas: There is a samba server Version 3.0.22 on Ubuntu Dapper see below for configuration details) and it is configured to authenticate against a Windows 2000 Server Ver. 5.0.2.195 preped for ADS 2003 and Exchange 2003 domain runs in "native" mode defined as global catalog wbinfo -u shows all ADS users wbinfo -t, wbinfo -D 'Domain' are all successful winbind is running /etc/nsswitch.conf has 'files winbind' for passwd, shadow and group. nscd has been activated and deactivated. The problem is, some Windows users trying to access shares or printers on the samba server cannot connect but some can. The only difference in the smbd logs (log level 3) I spotted is this: smbd/sesssetup.c:reply_spnego_kerberos(303) Username DOMAIN/someuser is invalid on this system for users that can't connect. When trying on the samba server: rpcclient -c 'lookupnames somename' -Usomeuser localhost -d 3 for a not working account, I get (IPs and names changed): added interface ip=1.2.3.5 bcast=1.2.255.255 nmask=255.255.0.0 lp_load: refreshing parameters Initialising global parameters params.c:pm_process() - Processing configuration file "/etc/samba/smb.conf" Processing section "[global]" Password: Connecting to host=localhost Connecting to 127.0.0.1 at port 445 Doing spnego session setup (blob length=128) got OID=1 2 840 113554 1 2 2 got OID=1 2 840 48018 1 2 2 got OID=1 3 6 1 4 1 311 2 2 10 got principal=cifs/principal.sub.domain.test@SUB.DOMAIN.TEST Got challenge flags: Got NTLMSSP neg_flags=0x60890235 NTLMSSP: Set final flags: Got NTLMSSP neg_flags=0x60080215 NTLMSSP Sign/Seal - Initialising with flags: Got NTLMSSP neg_flags=0x60080215 SPNEGO login failed: Logon failure failed session setup with NT_STATUS_LOGON_FAILURE Cannot connect to server. Error was NT_STATUS_LOGON_FAILURE The same command still on the samba server but with the ads servers IP: rpcclient -c 'lookupnames somename' -Usomeuser 1.2.3.4 -d 3 added interface ip=1.2.3.5 bcast=1.2.255.255 nmask=255.255.0.0 lp_load: refreshing parameters Initialising global parameters params.c:pm_process() - Processing configuration file "/etc/samba/smb.conf" Processing section "[global]" Password: Connecting to host=1.2.3.4 Connecting to 1.2.3.4 at port 445 Doing spnego session setup (blob length=117) got OID=1 2 840 48018 1 2 2 got OID=1 2 840 113554 1 2 2 got OID=1 2 840 113554 1 2 2 3 got OID=1 3 6 1 4 1 311 2 2 10 got principal=principal$@SUB.DOMAIN.TEST Got challenge flags: Got NTLMSSP neg_flags=0x62890215 NTLMSSP: Set final flags: Got NTLMSSP neg_flags=0x60080215 NTLMSSP Sign/Seal - Initialising with flags: Got NTLMSSP neg_flags=0x60080215 rpc_pipe_bind: Remote machine 1.2.3.4 pipe \lsarpc fnum 0x9 bind request returned ok. lsa_io_sec_qos: length c does not match size 8 rpc_pipe_bind: Remote machine 1.2.3.4 pipe \lsarpc fnum 0xa bind request returned ok. lsa_io_sec_qos: length c does not match size 8 somename S-<correct sid> (User: 1) I could not make out any difference in the user accounts between working and not working accounts. Any suggestions would be appreciated. Thanks in advance. Andr? Samba Server configuration: [global] dos charset = CP850 unix charset = UTF-8 display charset = LOCALE workgroup = SUB realm = SUB.DOMAIN.TEST netbios name = MYMACHINE netbios aliases netbios scope server string = bitkit interfaces bind interfaces only = No security = ADS auth methods encrypt passwords = Yes update encrypted = No client schannel = Auto server schannel = Auto allow trusted domains = Yes hosts equiv map to guest = Never null passwords = No obey pam restrictions = No password server = 192.168.0.69 smb passwd file = /etc/samba/smbpasswd private dir = /etc/samba passdb backend = smbpasswd algorithmic rid base = 1000 root directory guest account = nobody enable privileges = Yes pam password change = No passwd program passwd chat = *new*password* %n\n *new*password* %n\n *changed* passwd chat debug = No passwd chat timeout = 2 check password script username map password level = 0 username level = 0 unix password sync = No restrict anonymous = 0 lanman auth = Yes ntlm auth = Yes client NTLMv2 auth = No client lanman auth = Yes client plaintext auth = Yes preload modules use kerberos keytab = No log level = 0 syslog = 1 syslog only = No log file max log size = 5000 debug timestamp = Yes debug hires timestamp = No debug pid = No debug uid = No smb ports = 445 139 large readwrite = Yes max protocol = NT1 min protocol = CORE read bmpx = No read raw = Yes write raw = Yes disable netbios = No reset on zero vc = No acl compatibility defer sharing violations = Yes nt pipe support = Yes nt status support = Yes announce version = 4.9 announce as = NT max mux = 50 max xmit = 16644 name resolve order = lmhosts wins host bcast max ttl = 259200 max wins ttl = 518400 min wins ttl = 21600 time server = No unix extensions = Yes use spnego = Yes client signing = auto server signing = No client use spnego = Yes enable asu support = Yes svcctl list change notify timeout = 60 deadtime = 0 getwd cache = Yes keepalive = 30 kernel change notify = Yes lpq cache time = 30 max smbd processes = 0 paranoid server security = Yes max disk size = 0 max open files = 10000 socket options = TCP_NODELAY use mmap = Yes hostname lookups = No name cache timeout = 660 load printers = Yes printcap cache time = 750 printcap name cups server iprint server disable spoolss = No enumports command addprinter command deleteprinter command show add printer wizard = Yes os2 driver map mangling method = hash2 mangle prefix = 1 max stat cache size = 0 stat cache = Yes machine password timeout = 604800 add user script rename user script delete user script add group script delete group script add user to group script delete user from group script set primary group script add machine script shutdown script abort shutdown script username map script logon script logon path = \\%N\%U\profile logon drive logon home = \\%N\%U domain logons = No os level = 2 lm announce = Auto lm interval = 60 preferred master = Auto local master = Yes domain master = Auto browse list = Yes enhanced browsing = Yes dns proxy = Yes wins proxy = No wins server wins support = No wins hook wins partners kernel oplocks = Yes lock spin count = 3 lock spin time = 10 oplock break wait time = 0 add share command change share command delete share command eventlog list config file preload lock directory pid directory = /var/run/samba utmp directory wtmp directory utmp = No default service message command get quota command set quota command remote announce remote browse sync socket address = 0.0.0.0 homedir map = auto.home afs username map afs token lifetime = 604800 log nt token command time offset = 0 NIS homedir = No panic action host msdfs = No enable rid algorithm = Yes passdb expand explicit = Yes idmap backend idmap uid = 10000-300000 idmap gid = 10000-300000 template homedir = /tmp/ template shell = /bin/false winbind separator = / winbind cache time = 300 winbind enum users = Yes winbind enum groups = Yes winbind use default domain = Yes winbind trusted domains only = No winbind nested groups = No winbind max idle children = 3 winbind nss info = template comment path username invalid users valid users admin users read list write list printer admin force user force group read only = Yes acl check permissions = Yes acl group control = No acl map full control = Yes create mask = 0744 force create mode = 00 security mask = 0777 force security mode = 00 directory mask = 0755 force directory mode = 00 directory security mask = 0777 force directory security mode = 00 force unknown acl user = No inherit permissions = No inherit acls = No inherit owner = No guest only = No guest ok = No only user = No hosts allow hosts deny allocation roundup size = 1048576 aio read size = 0 aio write size = 0 aio write behind ea support = No nt acl support = Yes profile acls = No map acl inherit = No afs share = No block size = 1024 max connections = 0 min print space = 0 strict allocate = No strict sync = No sync always = No use sendfile = No write cache size = 0 max reported print jobs = 0 max print jobs = 1000 printable = No printing = bsd cups options print command = lpr -r -P'%p' %s lpq command = lpq -P'%p' lprm command = lprm -P'%p' %j lppause command lpresume command queuepause command queueresume command printer name use client driver = No default devmode = No force printername = No default case = lower case sensitive = Auto preserve case = Yes short preserve case = Yes mangling char = ~ hide dot files = Yes hide special files = No hide unreadable = No hide unwriteable files = No delete veto files = No veto files hide files veto oplock files map archive = Yes map hidden = No map system = No map readonly = yes mangled names = Yes mangled map store dos attributes = No browseable = Yes blocking locks = Yes csc policy = manual fake oplocks = No locking = Yes oplocks = Yes level2 oplocks = Yes oplock contention limit = 2 posix locking = Yes strict locking = Yes share modes = Yes dfree cache time = 0 dfree command copy preexec preexec close = No root postexec available = Yes volume fstype = NTFS set directory = No wide links = Yes follow symlinks = Yes dont descend magic script magic output delete readonly = No dos filemode = No dos filetimes = Yes dos filetime resolution = No fake directory create times = No vfs objects msdfs root = No msdfs proxy [Software] path = /opt/software/ guest ok = Yes [print$] path = /etc/samba/printer/ valid users = @printops write list = @printops force group = "printops" force create mode = 0664 force directory mode = 0775 [... stripped other shares ... ]