Hi, Currently we are running Citrix XP FR3, SP 4 on a Windows 2003. This past week, the servers have been rebooting themselves it seems later in the day. I can't find the cause and was wondering if anyone could recommend some software or utilities that can help me debug this issue. No errors in the event log at all and no service packs or changes have been done to the servers as well. Thanks for your help in advance. Bruno