https://gatewaybeta.fedex.com/GatewayDCworked for me i had the same problem, you should try setting up a local store with a self signed certificate, just to test that it is not a goddaddy issue with their SSL configurations.
also i was entering wrong the meter number
where the module configuration asks for a password it is actually asking for joola admin password, i did that and then everything worked as it should. (except for the fact that i want to offer fedex as an option if client is in a rush and does NOT want to use free shipping) but that is anoter topic
