JUst been over to
http://www.mozilla.org/projects/secu.../ssl_help.html
and found this:
SSL Protocol Versions
The Secure Sockets Layer (SSL) protocol defines rules governing mutual authentication between a web site and browser software and the encryption of information that flows between them. The Transport Layer Security (TLS) protocol is an IETF standard based on SSL. TLS 1.0 can be thought of as SSL 3.1.
You should normally leave both SSL checkboxes and the TLS checkbox selected in the SSL Preferences panel to ensure that both older and newer web servers can work with the browser.
Important note re TLS: Some servers that do not implement SSL correctly cannot negotiate the SSL handshake with client software (such as the browser) that supports TLS. Such servers are known as "TLS intolerant."
When the Enable TLS option in the SSL preferences panel is selected, the browser attempts to use the TLS protocol when making secure connections with a server. If that connection fails because the server is TLS intolerant, the browser will fall back to using SSL 3.0.
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So there you go. It's a server problem - nothing to do with CCBill per se.