Hi guys, I've been having a pretty serious problem over the last 18 hours or so. ISA seems to be locking up every 4 hours, almost on a schedule. Perfmon doesn't seem to provide any clues, memory usage is stable. Its running on Win2k Sp2 and I've installed the ISA "feature pack". I haven't touched it in months. Can anybody help me look for other issues? Thanks. -Warren