When running checkallsslcerts The commonName argument is invalid

Symptoms

When running the "checkallsslcerts" script to install or update the hostname SSL, you receive the following error:

The commonName argument is invalid

Description

There are restrictions on what the hostname of a server can be when requesting a free SSL. Hostnames that include a name that references Yahoo, Paypal, Amazon, Google, and other large entities will be rejected with the commonName error.

Workaround

Change your server's hostname to match the name of a domain that you control:

How to change the server's hostname from WHM