Can someone advise what a CN certificte is? Apparently I have one that does not match my server !?

I copied the following directly out of Windows XP's help glossary: certificate A digital document that is commonly used for authentication and secure exchange of information on open networks, such as the Internet, extranets, and intranets. A certificate securely binds a public key to the entity that holds the corresponding private key. Certificates are digitally signed by the issuing certification authority and can be issued for a user, a computer, or a service. The most widely accepted format for certificates is defined by the ITU-T X.509 version 3 international standard. As for the meaning of the "CN," I need to leave that to somebody else to answer.