Troubleshooting Admin Login Issues

From WHMCS Documentation

You can easily troubleshoot and resolve many login issues when you attempt to access the WHMCS Admin Area. Begin by checking for the errors below.

Errors

No Connection

A No Connection error on the admin login page suggests there is a problem preventing your server from communicating with the WHMCS licensing server.

For more information, see Troubleshooting a Licence Connection Error.

License Invalid

A Licence Invalid error on the admin login page may indicate that you entered an invalid licence key or that the WHMCS installation has been moved without updating the licence.

For more information, see License Troubleshooting.