Firefox wont access unusual tcp ports
Versions: Firefox 1.5.0
This address is restricted
This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection.
The correct workaround is adding a new string value to "about:config" called "network.security.ports.banned.override". Then enter a comma-separated list of port numbers to allow.http://wiki.mozilla.org/Firefox:1.5_Network_Error_Messages