On 12.12.2013, at 13.05, Andreas Schulze <andreas.schu...@datev.de> wrote:
> last week and today our dovecot pop3 server stopped responding. > Without any other logentries dovecot start to log only this: > > Dec 12 09:14:12 mbox1 dovecot: auth: Error: > ldap(testuser,192.0.2.110,<FBZH7lHtAQAK/FCj>): > ldap_search(base=ou=accounts,dc=example,dc=de > filter=(&(|(uid=testuser)(mail=testuser))(!(state=blocked)))) failed: > Operations error > > For every pop3 Session, ~2000 per Minute ..., over 10 Minutes > I send dovecot a SIGTERM. After dovecot was started again, all was fine again. > > # doveconf -n > http://postmaster.datev.de/tmp/dovecot.conf > > The LDAP-Server itself did resond to queries in the same timeframe. I know > this because the MTA on the same host was able to deliver messages into > mailboxes. Likely the difference is that Dovecot keeps the LDAP connection open for a very long time, while MTA likely recreates new connections often (maybe even every time). I guess the fix would be to simply treat that error as "reconnection required": http://hg.dovecot.org/dovecot-2.2/rev/ea38559ffd4e
