Read this thread and scroll down to where it describes Connection Refused.

You're not banned from the server or network, but it is actively refusing your connection. Try a server that is closer to your location, or just another server in general. For a server list, try the network's website - search Google if you don't kknow the website address. Whilst you're there, you might try contacting the network administration and say you're having issues connecting.

Do you get Connection Refused with every network you try? (Try,, and so on).