cpkeyclt failing: Can't confirm this connection was from a root owned process.

Symptoms

When attempting to update the cPanel license, you receive a failure resembling the following:

CONFIG_TEXT: The exact message was: Can't confirm this connection was from a root owned process. (203.0.113.2)

Cause

This error is caused by the request from the licensing server failing to deploy the license file as it cannot communicate with the server over port 2083.

Resolution

Ensure that the server's firewall, host access controls, and other security software allows for inbound connections from the cPanel license servers over port 2083.

What cPanel IPs do my cPanel servers need to connect to?

Additional Information

What ports need to be open in the firewall for the cPanel license server?