[Samba] Winbind runs great for a while then dies with "read from socket failed!"

c-ssugimoto at hitachijoho.com c-ssugimoto at hitachijoho.com
Wed Nov 28 02:39:18 GMT 2007

Hello all,

I experienced a same problem with http://lists.samba.org/archive/samba/2003-January/059073.html

I use following.

Hardware: Dell PowerEdge 2950
OS: Red Hat Enterprise Linux ES4 Update 4
Kernel: 2.6.9-55.0.2.ELsmp
RPM packages are:

Samba server is a member server (Security=ADS) of Win2003 R2 Active Directory.
	net ads join is OK.
	'getent passwd' or 'wbinfo -u/g/t' are no problem.
winbind is used for user authentication for dovecot(POP3).

After a while (3months), winbind dies with following message, then authentication doesn't work.

pam_winbind[PID]: read from socket failed!
pam_winbind[PID]: internal module error (retval = 3, user = `username'
pam_winbind[PID]: write to socket failed!
dovecot(pam_unix)[PID]: check pass; user unknown
dovecot(pam_unix)[PID]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
out of memory [PID]
pam_winbind[PID]: request failed: No logon servers, PAM error was 4, NT error was NT_STATUS_NO_LOGON_SERVERS

After restarting the server, there is no trouble.

I want to know ...
	Why this trouble occurred?
	What is the cause?
	How can I reproduce?

Any help is appreciated,

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