Salem

My antivirus is blocking the adress, that the game is connecting to. White lists, permissions - nothing works, "This one's in the database of potentially dangerous sites".
ESET NOD 32 antivirus.

Yeah, I've heard this ESET program does that. There's not a lot any of us can do about it though, of course. You'll have to ask its makers why they do this. :)

Unistall your java (Most likely you are running java 7) Then install java 6. It sorted my problem http://www.java.com/en/download/manual_v6.jsp