This happens in our Production Web server. Sometimes the processor usage spikes to 100% and doesn't come down. The server hangs and we need to force it by doing an IISreset. The process that takes all 100% is w3wp.exe. IIS logs for this period looks normal with regular traffic. This has happened...

Hi Zhao, This happens in our Production Web server. The Active Session count is consistently around 4294958367. Memory usage on the server looks normal though. When there is iisreset, the count goes down to 0 and comes back to this huge number in a few minutes. There is only one website running on this...