Error 10061 is Connection refused. it's mean no connection could be made because the target machine actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host (your machine in this case). maybe that the server application you're trying to contact isn't executing

I already been on that site, it didn't really help much. It happens on the client.

Check if your ports are forwarded correctly

Well, it worked for all these players: http://www.key2heaven.net/top100.html

So the port is forwarded correctly. It just happens to 1 person.

Zephius spouts useless crap. He reminds me of Genisus so much..

Maybe it's a problem with HIS computer in general, and not your source.

How is it useless crap. Connections aren't being established, a logical thing to check would be the port forwarding.

Not if everyone else is clearly connecting perfectly fine.

Networking isn't as simple as that, in fact it is probably the most unattractive thing in computing. What happens if you download a torrent without ports being forwarded correctly? You will get connections, just at very low speeds. Open up the port and you can triple your connections and speed in a few seconds.