I know I've asked this before, but I don't recall the answer. Every morning, between 8:30am and 9:30am, we experience a massive slowdown of traffic passing through the ISA server. This lasts for 5-10 minutes, and then goes away. The time varies, but is usually within that one-hour timeframe. The level of slowdown also varies, sometimes it is barely noticeable, sometimes (like this morning) it is totally unusable. I've reviewed all the logs, watched the traffic levels, etc... I have been unable to trace what is causing this, traffic just seems to go to a stand-still. Each morning I again attempt to track it down, but I only have a few minutes to investigate, then it is gone. The problem does appear to be centered around our ISA server, but I haven't determined that it is "solely" the problem. Anyone have any good ideas on how to track this down?