IIS: Application pool stops randomly within in a specified time period

Updated on     Kisan Patel


Application Pool Stops automatically.

503 Service Unavailable when not using default application pool.

Application Pool automatically stop due to a series of failures.


Rapid-Fail Protection disables application pool if it crashes several times within in a specified time period.

To prevent an Application Pool from stopping, you can disable Rapid Fail Protection in IIS:

Open Internet Information Services (IIS) Manager > Application pools > choose application pool > Advanced Settings.

Scroll down to Rapid Fail Protection and change the option Enabled from True to False. Click OK to apply the changes.

Rapid-Fail Protection


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