Not being able to connect to my clan server

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Hi guys ive just upgraded from a laptop to a amd 2700 dual core with a nvidia 1 gig gfx card and windows vista altimate. Now for some reason my clan server is showing as a grey ? in the ping section and when i join what hapens is i get the joining game tag. Then kicked back to selection screen and told coneecting failed nothing more.

I connect via my router via ethernet cable all ports etc etc are open all firewalls are disabled. Weird part is i can join other servers fine tried at least 6 so far and no probs just cant get into mines any suggestions/help.