solaris terminal sessions terminated and also nohup jobs

Admins,

We have a strange problem on our solaris zones. We have four zones on a Global server (Sun-Fire-V890; Solaris 10 Update 6) and the SSH sessions to all four zones are terminated at a specific time (11:10 PM) every night. The SSH session to the global server is not terminated.

Also, any jobs that were started with nohup are also killed.

I was wondering how to go about resolving this. Has anyone experienced this before? Is there a reason to believe this could be caused by some missing packages in Solaris?

Any pointers would be most appreciated!

Thank you!
JP.

Assuming any user logged in gets killed, what's in root's crontab at or just before that time?

And what's in /var/adm/messages about that time?