Comment Save the certificate (Score 1) 286
SSL certificates have two goals, identity/trust and encryption. Self-signed certs establish encryption by default. If you save the self-signed certificate in your browser, then trust/identity is established manually, which is the only selling point of of a cert signed by a CA. Once you have the cert saved an error message is no longer displayed unless the certificate changes.
Firefox has this option selected by default upon bypassing the initial error message. In IE, view the certificate and "Install certificate..." Done.