I am hoping someone can give me a pointer in how to troubleshoot this. I have just installed ISA server with isa sp1 on a win2k web server of ours. Since then this machine reboots itself at least twice a day. It has been happening outside office hours so I am not able to see what the blue screen says. There is nothing in the event logs when this happens except for the messages when it restarts. We have IIS running on this machine also with a number of websites published using IP Packet Filters. Has anyone had this type of problem before ? Where do I start to narrow down the problem ? Reinstalling this machine is the last resort, I will only do this if I cannot find any other way. Patrick