Also check the version of the game you are running. If you are not running "
Version 2.05 Patch 3", then you must update the game. Any version prior to that will not know where the authentication server is.
If you have "
Version 2.05 Patch 2", you can use
this. to update. If you have an earlier version, then go ahead and grab the latest release.
If you are running, "
Version 2.05 Patch 3", and can get to the WEB page, but cannot get past the login to see the arena list, then something is blocking the port the game is trying to connect on to authenticate.