if you are conecting from school's/public place internet, problably FH game is blocked.
Solving connection problems it's a hard thing (even for me), can be many different problems. The better thing you can do is to:
-Check the server is online.
-Try with another internet conection (ex: your neighbor or friend's internet)
-Try with another computer
-If you are using wireless conection, go to near to the anthena or conect with cable.
-Try to disable firewall programs.
-Try to conect the internet cable(LAN), direct to your computer without using router. (caution, you can make a wrong configuration of your computer and make the situation worst).
-Ask to you ISP (Internet service provider) if they are blocking game conections or UDP conections.
i'm not expert in conections problems.