Crossfire wont work!!! help!!!!!!!!!

Okay, i havent played in 3 weeks because ther is a problem with Crossfire. I will load the game, and then it will have me sighn in. Then i press 'Ok' and then it just freezes. it doesnt even sighn me in.Then it just says "Dissconected from server". I have tried reinstalling Crossfire, adding and forwarding ports, and it still wont work. I really need help.