Unable to install license key on the server with incorrect time. Error: The license key is invalid

Symptoms

• When opening Plesk the following message appears:

  PLESK_ERROR: Error: The license key is invalid. In order to use Plesk, you need to obtain and install a new valid license key.
  Your license key has expired. To continue using your Plesk, you must purchase a non-expiring commercial license key.

• During the attempt to retrieve license key or install a valid one through Plesk > License Management , the following error appears:

  PLESK_ERROR: Error: Updated license key is not valid.

• The following command shows incorrect date:

  # date

Cause

Wrong time is set on the server.

Resolution

1. Connect to the server using SSH .

2. Set the correct time with a help of commands described here: How to Change the Linux Date and Time: Simple Commands .