In general, you can also try http://www.gameranger.com/download/GameRangerSetup.exe in such cases. It's a really good alternative to Hamachi. You just need to register. You will definitely receive registration emails at www.gmail.com.

By the way, there are many players there who play in WCL leagues, and you can see all the games that are currently being played. Our players also play there, such as: Captain, bRitvo4kA, redwhait, etc.

In general, give it a try, because Hamachi sometimes has a lot of issues.

(I haven't used it personally).

PS: It would be great if each player, in addition to the universally loved Hamachi, also knew how to use GameRanger, so that they could play/finish a game when the first one fails, without having to go through tedious explanations.