Trying to retrieve the URL: server_hostname:11444

Sometime you may receive the following error message while trying to access the plesk “https://IP:8443”.

********
This webpage is not available.

or

The webpage at https://server_hostname:11444 might be temporarily down.

or

ERROR The requested URL could not be retrieved. While trying to retrieve the URL: server_hostname:11444
*********

This issue mainly happening when you upgrade plesk to 9.X version.

You can try following fix from your end.

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1. Login to the server through SSH.
2. Execute the following command to disable SSO.
/usr/local/psa/bin/sso –disable
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Most of the case the above fix will resolve the issue. 🙂