i realized just recently that our server time is off track by 30 minutes! don't know how this could happen, but we do not have a sync with external ntp running, which is no good.
i tried to change this via: ->webmin-> hardware-> system time-> time server sync
but apparently this leads to problems with dovecot, i can not restart the service (on shell): Restarting IMAP/POP3 mail server: dovecotLast died with error (see error log for more information): Time just moved backwards by 1801 seconds. This might cause a lot of problems, so I'll just kill myself now. http://wiki.dovecot.org/TimeMovedBackwards
Can anyone give me some hints how i can switch time and even better implement ntp sync properly.
The server is hosting some 50 mail accounts and not so critical web-content, it's easy take it offline for a couple of minutes, planed of course.