Well, your ip might not be configured correctly to allow connections through it. Firewalls, etc...
Well the forum was working for me a few minutes ago.
Woohoo
it stopped working without doing anything, and now it works again without doing anything... any explanation for this?
If it's a shared host, no wonder as the server could of been down.
destroyer, that sounds like a good question to ask your host. They would know much more than we would know.