about ones a week or monthly my SLES10SP4/OES2SP3 Dell server reboots without any recognizable reason.
There is no loss of electrical power (the other servers will run without break and the server uses a UPS).
It doesn't seem to have a reason in consumption of ressources (last reboot was on sunday at 04:15 am).

The log files (messages, warn, boot.osmg) don't show any error or warning in the time before reboot.
The Dell server shows no hardware / temperature problem in his display.
The server isn't connectet directly with internet, only http and groupwise related ports are connected via firewall rule in our proxy, so I don't think (hope) that there is a internet attack.

Do you know any other logfile or place where I can look for the reason for rebooting?

Thanks for your help,