Symptoms
- Unable to access Plesk UI or some websites, it keeps loading endlessly.
- There are no errors at Domains > example.com > Logs page, in
%plesk_dir%adminlogsphp_error.logfile or in the Event Viewer. - Reconfiguration of PleskControlPanel website in IIS does not help.
Cause
IIS web-server does not handle requests properly.
Resolution
Note: IIS restart will make all the websites offline for a while, consider doing it in maintenance time.
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Connect to the server via RDP.
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Open command prompt and clear IIS cache:
C:> "%plesk_bin64%"websrvmng.exe --remove-sites-cache
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Restart IIS web-server:
C:> iisreset
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If the issue persists, reboot the server.