Well, the acid test says it is a firewall issue.
Here is the test.
If you can connect to our WEB site with your browser, but cannot get connected to login, then it is a firewall issue as the login authentication server is running on the WEB page server. The only difference is the port it uses.
Everytime we update the game, software firewalls will need to re-allow the game back through. However, if you are running Norton on Vista, and it triggers, there is a good chance you will never be able to play the game again until you remove Norton from the computer. It might work again once it is re-installed, but there is no way to disable Norton under Vista. The option is broken under Vista.
There is a whole series of events that has to take place to lead up to that. Once it happens, the only way to fix it is to remove Norton from the computer.