Return
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Title
IIS AppPool frequently stopping with the error: Application pool 'ARWebAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool. -
Description
On the machine hosting the Active Roles Web Interface, the IIS AppPool (ARWebAppPool by default) will frequently stop.
Application Event Viewer logs show errors similar to the following:
A worker process serving application pool 'ARWebAppPool' has requested a recycle because it reached its private bytes memory limit.
and
Application pool 'ARWebAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
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Cause
The ARWebAppPool is recycling its private memory too often and exceeding the default settings.
The default private memory value is 1 GB. Any medium-to-large size organizations commonly hit 1 GB, some very frequently.When this happens, the AppPool will recycle memory. The issue lies in the fact that a memory recycle is considered to be an error by the IIS Rapid-Fail Protection feature which is enabled by default. So, if five recycles occur within five minutes, this will meet the default settings of Rapid-Fail Protection, which will stop the IIS service.For those, we can't give a recommended value because each environment's usage is going to be different. Therefore this is more of a trial and error on the specific environment.You can try increasing it 1 GB at a time until it reaches a point where the application pool is no longer recycling, and then add 1 GB more to allow for wiggle room. It is best to do this during normal usage times during the day for the most accurate results. -
Resolution
WORKAROUNDIncrease the value allocated to the ARWebAppPool private memory.The current settings can be viewed in the IIS Manager:- Expand the host name and click on Application Pools
- Right-click on ARWebAppPool and choose Recycling...
- The value is noted under Private memory usage (in KB)
The default value is 0 (Unlimited).