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OpenLDAP / PAM: No Username


I'm running OpenLDAP 2.4.23-7.2 (from Debian Squeeze). Most of the time everything works fine, the LDAP-Server is used by libpam/libnss, Samba, Dovecot and Postfix. Sometimes when I log into the Server via SSH the command prompt displays "Ich habe keinen Benutzernamen@servername" (which means "I don't have a username") instead of my username. The login itself works fine. The real problem is that if this happens the Mailserver isn't able to deliver mails:

status=bounced (unknown user: "myusername")

Using google I found some other users with the "don't have a username"-Problem, but most of the time they had a ACL-Problem. As the LDAP-Server usually is working it seems that this isn't the problem.

Also the problem is gone when I restart the whole machine (just restarting slapd doesn't help).

Any ideas?

Denis Witt