If you are able to connect to other servers its most likely because the ip is being blocked at you or the host blocked you.And if this helps i can get in some servers and my friends cant get in the server i join cause they have same bug on the server i can join.....
No idea which. The best way to find out if your IP is blocked from connecting to open up CMD.
But now to think of it even i cannot ping it
I think this is a server related issue. AFAIK @ice cold is the owner.
I personally can connect to the server, but you can't. This must be a host problem.