In this tutorial, I will explain how to update cPanel License key of a server / vps. cPanel license key can be updated from SSH. You need to update your server license key when you have a new licence key, or you want to upgrade from trail version to paid version.
Login to your server as root and via SSH and run following command
Now try to login in WHM using URL: http://server-ip:2086 OR http://server-ip/whm