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I have a web application running on Windows 2008 R2 Service Pack 1. From time to time ApplicationPool becomes disabled and I have to restart it manually. The time between crash and restart is critical.

In the Event Log I see 5 warnings and 1 error.

WARNING 1: A process serving application pool 'MyAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '4028'. The data field contains the error number.

WARNING 2: A process serving application pool 'MyAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '6400'. The data field contains the error number.

WARNING 3: A process serving application pool 'MyAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '27892'. The data field contains the error number.

WARNING 4: A process serving application pool 'MyAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '30180'. The data field contains the error number.

WARNING 5: A process serving application pool 'MyAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '14816'. The data field contains the error number.

ERROR: Application pool 'MyAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

Do you happen to know what is the issue? What should I do in order to fix it?

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Quoting from this stackoverflow answer:

IIS comes with a feature called Rapid-Fail Protection. By default an App Pool is configured to become disabled if a worker in the pool crashes 5 times within a 5 minute span.

The thresholds of this setting are able to be modified by right clicking on the App Pool going to Advanced Settings and modifying the 'Rapid-Fail Protection' properties. However, this event indicates that there is likely a serious issue in your application that needs to be resolved.

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