Service Unavailable error message on a server with Plesk Windows

Plesk Error : Service Unavailable

Error under Event Viewer :

The identity of application pool ‘PleskControlPanel’ is invalid, so the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled.

Try Plesk Reconfigurator > Repair Plesk Installation with checked option Plesk Services this fixed the issue which I faced.

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