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Website shows 503 internal server error: CPU time for application pool has been throttled

Updated January 02, 2019 15:08

Applicable to:

Plesk Onyx for Windows

Symptoms

Website inaccessible:

CONFIG_TEXT: 503 Service Unavailable
Application Pool and the website are running
The following error can be found in Event Viewer:

CONFIG_TEXT: CPU time for application pool 'example.com(domain)(4.0)(pool)' has been throttled.

Cause

Application Pool misconfiguration.

Resolution

Connect to Plesk server using RDP.
Open IIS(Internet Information Services):

C:\> inetmgr
Navigate to IIS > SERVER_NAME > Application Pools
Right click on the appropriate Application Pool and click Advanced Settings
Set the Limit to 0 and Limit Action value to NoAction .

Additional information

How to monitor and manage CPU usage for domains in Plesk for Windows

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