Your error means: SSL received a record that exceeded the maximum permissible length.
This is an issue with the FF Beta and you should not use it for a production environment. If you switch over to a released version of FF or Internet explorer this will resolve your issue. Expect the security to be brought up to snuff in the final version or at least a RC for 3.
I actually solved this on my own… it turns out that RWW and OWA were forcing SSL connections on port 443, which was not forwarded to the server. I forwarded this port, and now it works. For the record, it wasn’t work on any version of Firefox or IE7.