Exchange App Pool Unresponsive
Hello, I am having a few problems with my App Pools in MS Exchange not recyling properly and I am not sure how to resolve/troubleshoot the issue. I am getting the following two errors in my event logs:Log: SystemSource: WASID: 5013A process serving application pool 'MSExchangeSyncAppPool' exceeded time limits during shut down. The process id was '8872'. Log: ApplicationSource: IIS-W3SVC-WPID: 2262ISAPI 'C:\Windows\Microsoft.NET\Framework64\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'.Any thoughts on how to resolve this? This happens anywhere from 5-20 times a day. Thoughts? Thanks!
July 8th, 2009 11:32pm

It should definitely *not* need to be recycled 5 - 20 times per day. What version of Exchange? Service Pack? Are hot fixes applied?Jim McBee - Blog - http://mostlyexchange.blogspot.com
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July 9th, 2009 12:52am

Thanks for the reply! Okay, yeah,it didn't seem right to me (it did it ungracefully 10 times just over the night last night). I am running Exchange 2007 SP1 with Update Rollup 8 applied (should be the latest that i am aware of). The OS is Windows Server 2008 x64 SP2.There are not any specific hotfixes applied. Thanks!
July 9th, 2009 4:28pm

Hi, This problem might occur because ASP.NET limits the number of worker threads and completion port threads that a call can use to execute requests. I think it could be a asp.net related issue. I recommend you to follow the steps in kb 828222 to generate the dump file and then post the issue in IIS.net forum to get relevant help. Note: Please ensure that theres no other web application installed on the IIS server. We may need to perform a clean-boot to see if the issue caused by the 3rd party applications. 828222 How to generate a dump file when ASP.NET deadlocks in IIS 6.0http://support.microsoft.com/default.aspx?scid=kb;EN-US;828222 Microsoft IIS forum http://forums.iis.net/ More information to share with you: Contention, poor performance, and deadlocks when you make Web service requests from ASP.NET applications http://support.microsoft.com/kb/821268 ASP.NET Thread Usage on IIS 7.0 and 6.0http://blogs.msdn.com/tmarq/archive/2007/07/21/asp-net-thread-usage-on-iis-7-0-and-6-0.aspx 1. Set the values of the maxWorkerThreads parameter and the maxIoThreads parameter to 100. 2. Set the value of the maxconnection parameter to 12*N (where N is the number of CPUs that you have). 3. Set the values of the minFreeThreads parameter to 88*N and the minLocalRequestFreeThreads parameter to76*N. 4. Set the value of minWorkerThreads to 50. Note: minWorkerThreads is not in the configuration file by default. You may need to add it. Regards, Xiu
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July 10th, 2009 9:47am

I'm faced with the same problem and try to understand the basics (IIS for exchange server) involved here. Is there a document that described the optimal settings for IIS (ASP.NET) for exchange (2010 SP1 on Server 2008R2 SP1)? In the above mentioned document are (atleast for me) too many exchange-IIS unknows (asynchronous request, versions of framework,...). Regards Daniel
March 20th, 2011 8:24am

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