did you already hosted a game & did the connection test ? If so, and if it was successful, then it means the player you try to reach didn't configure his connexion correctly.
If it does this with everybody, then it's u who didn't configure it correctly. You have to open the port 4321 in your Firewall, and forward it in your router. Read the doc & search in the forum for more info.
== Mana Games ==
>> I don't answer Private Message, except if it's really a _Private_ topic <<