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App Control: IIS "DefaultAppPool" is getting disabled due to failures

App Control: IIS "DefaultAppPool" is getting disabled due to failures


  • App Control Server: All Supported Versions
  • Microsoft Windows Server: All Supported Versions
  • Microsoft IIS: All Supported Versions


  • After conducting a large amount of agent upgrades, the App Control console is unavailable.
  • Windows event logs show "Application pool 'DefaultAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool."


  • IIS "DefaultAppPool" private memory is set too low. This will cause the application pool to crash and render the App Control services that serve this pool to also be disabled.


  1. Increase the private memory size of the IIS "DefaultAppPool" to 3Gb (recommended)
  2. Restart IIS

Additional Notes

  • If setting the "DefaultAppPool" priviate memory to 3Gb is not possible, set it as close as it can be to this number
  • After upgrading the App Control server (e.g. 8.1.4 to 8.1.6, etc.) the Private Memory Limit may get reset back to the 1gb default. Please check to ensure the 3Gb limit is still set and if not, change it back to 3GB.

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