30 Minutes (system time/ntpdate/dovecot)

[David Baron <d_baron@012.net.il>]

Has been happening quite a bit lately:

Problem with ntpdate. If and when it finally works, get a change of 10,800 
seconds ... that is 30 minutes.

The dovecot IMAPd server is unreadable. Restarting it yields a complaint about 
10,800 seconds of time, killing itself now! Restarting it again works OK.

What's happening? Bug? Fix?