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IIS 7.5 cpu goes to 100% after response ends

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Hi,

We have a web application that has been running on windows 2003 for several years without this issue.  On Windows Server 2008 R2 however, after the response ends for a certain page output, the webserver w3wp.exe process goes to 99% and stays there for 45 or so seconds.  While this is occurring the page is half rendered and the user is waiting for the rest of the page.  After waiting for the 45 seconds, the page completes and is correct and everything on the server goes back to normal.  I have put logging code in the page and the application has completed it's process but the webserver hasn't sent to the browser evidently.

Does anyone have any idea what could cause this behavior; or, does anyone know how to determine what the IIS server is doing when it goes to 99% CPU usage?

Thanks,


Lloyd Carter


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