[Dovecot] Restarting dovecot-auth stops authentication

[Timo Sirainen]

On Wed, 2010-11-17 at 21:17 +0100, Attila Nagy wrote:

> pop3-login: Error: net_connect_unix(pop3) failed: Connection refused

Right. This is the main problem. So the question becomes why is the
connection being refused.

> I've checked, auth's start time is yesterday, so it wasn't restarted. I 
> guess what remains is the resource limit (client_limit maybe?).

If that happens, there should be a log entry. You can grep process_limit
and client_limit from logs.

> The strange thing is according to tcpdump, dovecot does very few LDAP 
> lookups, and they are answered in a reasonable time, but I haven't done 
> a strict correlation with the above errors.

This shouldn't have anything to do with authentication.

> How does dovecot logs timed out LDAP lookups?

"Connection appears to be hanging, reconnecting"

I usually log errors to a different log file. Normally that file should
be empty, so you can easily see all the errors and warnings that could
be causing problems.

log_path = /var/log/dovecot-errors.log
info_log_path = /var/log/dovecot-info.log