I've recently installed ISA 2004 on a MS 2003 Server. When the machine starts without ISA Services, everything works fine, but when ISA Services are sets to "Automatic" and starts with the computer, I get those errors in the event log:
1097 Userenv : "Windows cannot find the machine account, no authority could be contacted for authentication" 1030 Userenv : "Windows cannot query for the list of group policy objects. Check event log for possible..." 1053 Userenv : "Windows cannot determine the user or computer name (the remote procedure call failed and did not execute). Group policy processing aborted.
The results are that every sessions to ISA are anonymous, I cannot add any user to manage my server...