When you install WHMCS on a server, make sure to watch for errors both during and after the installation process. You might see license-related errors if you cannot connect to the WHMCS license server or there is a misconfiguration in your system. Troubleshoot and resolve Curl Error - Couldn't connect to host (7) errors. Troubleshoot and resolve Curl Error - Couldn't resolve host (6) errors. Troubleshoot and resolve Your license key is invalid errors in the API. Troubleshoot and resolve License Invalid errors. Troubleshoot and resolve Invalid License errors on HostGator servers. You can view license information, force license updates, and change your license key from within the WHMCS Admin Area. Troubleshoot and resolve A license key is required. errors during installation. Troubleshoot and resolve No Connection licensing errors. Troubleshoot and resolve You are currently accessing the admin area using an insecure connection errors. The Software Licensing addon module allows you to license and sell your own web applications and implement remote license checking. In some circumstances, you must force WHMCS to perform a license update. For example, you may need to do this after purchasing a new addon module. When you move your WHMCS installation from one server to another, you may need to perform additional steps like updating your license. When you move your WHMCS installation from one subdomain to another on the same server, you may need to perform additional steps like updating your license. Recalculate the Recurring Amount value for a service. You must do this after certain actions, like expiring a cPanel Licensing license.