cron exits, stops

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http://serverfault.com – On Debian Squeeze, cron stops running. /usr/sbin/cron isn't listed in the process list anymore and jobs aren't executed. This is the last cron syslog entry: Sep 22 23:13:31 297024 /usr/sbin/cron[1663]: (CRON) INFO (pidfile fd = 3) Sep 22 23:13:31 297024 /usr/sbin/cron[1664]: (CRON) STARTUP (fork ok) Sep 22 23:13:31 297024 /usr/sbin/cron[1664]: (CRON) INFO (Running @reboot jobs) I can manually restart cron daemon without any error messages. But some minutes later it's shutdown again. How can I find the reason why cron is exiting? (HowTos)