Whenever I try to use the 'Chat' feature, this message pops up:

''The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted access to the web.''

Any ideas what might be causing this? Because I really want to participate in the chat.

(Note that I've already tried disabling the firewall, but nothing's changed.)

Thank you.