Title says it all. I have tried to log into a specific server (I know that the IP is right). It is a very popular server, and I was able to connect just the other day. I have tried to connect with a 100% vanilla .minecraft (thinking that my mods were the issue) and still no dice. I tried to reset my router, among a few other silly things which shouldn't have anything to do with connectivity to a server. I am able to connect to any other server, just not this one.
Anybody have any insight as to what the problem could be?