http://forums.iis.net/1038.aspxA forum discussion around administering, configuring, and limited usage on ASP.NET 1.x, 2.xenCommunityServer 2007 SP1 (Build: 20510.895)http://forums.iis.net/thread/1869880.aspxTue, 20 May 2008 15:13:42 GMT50bcf3b4-f6fe-4638-adff-0c150e922e99:1869880jeff@zina.com0http://forums.iis.net/thread/1869880.aspxhttp://forums.iis.net/commentrss.aspx?SectionID=1038&PostID=1869880<p>Might strat with:</p> <p><a href="http://blogs.technet.com/marcelofartura/archive/2006/09/15/456363.aspx">http://blogs.technet.com/marcelofartura/archive/2006/09/15/456363.aspx</a></p> <p>Jeff</p>http://forums.iis.net/thread/1869877.aspxTue, 20 May 2008 15:02:44 GMT50bcf3b4-f6fe-4638-adff-0c150e922e99:1869877arunsun0http://forums.iis.net/thread/1869877.aspxhttp://forums.iis.net/commentrss.aspx?SectionID=1038&PostID=1869877<p>This happens in our Production Web server.&nbsp;Sometimes the processor usage spikes to 100% and doesn&#39;t come down. The server hangs and we need&nbsp;to force it by doing an IISreset.&nbsp;The process that takes all 100% is w3wp.exe. IIS logs for this period looks normal with regular traffic. This has happened a couple of times already and appears to happen more frequently now. We are unable to find any pattern in this. </p> <p>To solve this problem, we&nbsp;do an automated IIS Reset when the CPU spikes over 90%, this brings the processor back to normal.</p> <p>Also, on this server, Active Session count is consistently around 4294958367(4 billion). 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. </p> <p>There is only one website running on this server and the website has its own AppPool. Operating System: Windows 2003 Server R2 Enterprise Edition running IIS V6.0</p> <p>What could be causing this?</p> <p>Thanks..</p>