[BlueOnyx:08913] Curious problem with dovecot

[Dirk Estenfeld]

Hello,

on one blueonyx (5106R) server I have since some weeks an interesting problem with dovecot.
Users are polling mails with pop3 or imap. Every 1-2 weeks from one second to the other a user which have received emails all the day get message "please enter your password" and in /var/log/maillog I get the message:

Oct 27 20:00:03 wire dovecot: pop3-login: Aborted login (auth failed, 1 attempts): user=<abc>, method=PLAIN, rip=1.2.3.4, lip=5.6.7.8
Oct 27 20:01:06 wire dovecot: imap-login: Aborted login (auth failed, 1 attempts): user=<def>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured

But not all users have problems. Other user can still access via pop3 or imap. 

Oct 27 20:02:32 wire dovecot: pop3-login: Login: user=<abc>, method=PLAIN, rip=1.2.3.4, lip=5.6.7.8
Oct 27 20:02:37 wire dovecot: POP3(abc): Disconnected: Logged out top=0/0, retr=0/0, del=0/37, size=13382981
(some minutes later, also this user got an "Aborted login")

I did a pam_abl -p but without success, I restarted pam_abl, no success.

After I did a "killall -HUP dovecot" authentification for the users was possible again.
In the Moment I have no idea where the problem is. Maybe dovecoth auth_cache?

Is there anybody who can give me a hint why dovecot run into trouble?

Best regards,
Dirk



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