Unable to access Plesk: The number of websites hosted on the server exceeds the limits defined by your license

Symptoms

The following alert is shown while trying to access Plesk GUI:

The amount of resources you operate with has exceeded the limits defined by your current product license. Please contact Plesk sales department and purchase a new license key.

Cause

Plesk license used previously is no longer valid or included higher number of domains. 

Resolution

1. Connect to the server via SSH/RDP;

2. Verify number of domains on a server:

   # plesk db "SELECT COUNT(*) FROM psa.domains WHERE parentDomainId = 0"
   +----------+
   | COUNT(*) |
   +----------+
   | 8        |
   +----------+

3. Find your activation code and install it. After order for Plesk license is paid, activation code is sent to registered email address via email. In case emails were lost, license activation code may be found in your Plesk 360 account

   # plesk bin license -i XXXXXX-XXXXXX-XXXXXX-XXXXXX-XXXXXX

4. If you have more domains than allowed by your license key you have two options you can upgrade license to higher edition.
5. Alternatively, decrease number of domains by removing those you don't need:

   • List all domains on the server (for both Windows and Linux OS):

     # plesk bin domain --list
     # example.com
     # example.net

   • Remove domains using command line:

     # plesk bin domain --remove example.net