SSL Certificate warning when visiting the Plesk login page

Applies to :

  • All Linux versions of Plesk
  • All Windows versions of Plesk


When you visit the Plesk control panel via HTTPS (e.g. ), your web browser will pop up with a warning message stating that the SSL certificate could not be verified.

The message may vary, depending on the browser. For example, in Firefox it will say "This Connection is Untrusted" as shown below:

It can be safely ignored, the browser comes up with that warning because it cannot recognize self-signed certificates (web browsers can only recognize SSL certificates that you purchase from CAs like Verisign, Geotrust, etc.). If you see the certificate error then there is no need to worry as the connection is still encrypted. It is a fact that Parallels (formerly known as SWsoft) is not a trusted signing authority. Parallels (the makers of the Plesk control panel) signs SSL certificates themselves, but since they are not a trusted signing authority, a certificate error is generated.

If you are using Firefox, please follow the steps below:

  1. Click "I Understand the Risks". 
  2. Click the "Add Exception" button, then a new window will appear.
  3. Click Get Certificate and follow by clicking "Confirm Security Exception".

Once you are done with the above steps, you should be able to see the Plesk control panel login page.

Did you find it helpful? Yes No

Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.