IIS 7.5 site stops serving requests for no apparent reason

At apparently random times, our web server stops serving requests.  I can find nothing in the server logs that would be a reason for this.  All services are still running.  To correct, I stop and restart IIS.  I've done some searches on line and found where it could be an ASP performance issue.  I've searched the error codes and could not find them on my web server.  So, I don't think it is an ASP issue.  Any ideas.

OS-Windows Server 2012
IIS 7.5
Jack SeamanAsked:
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Are you doing any kind of performance monitoring ?

It might be possible your app may be out of memory or some other issue, I would suggest you do some perfmon tracing in order to identify system resource states when this happens.


Also you might want to just configure perfmon tracing for memory / cpu utilization etc.

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Jack SeamanAuthor Commented:
I got perfmon tracing on for memory and cpu.  The next time the web site stops responding, I will check the memory and cpu utilization before restarting IIS. It could happen this afternoon or a few days from now.
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Windows Server 2012

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