I have a problem with my amsn :S

Hello,
i got my mac a couple of months ago and it works great n everything but just yesterday my amsn doesnt work! everytime i tipe in my password n hit sign in the program gets stuck n after a few minutes a massage pops up n says that n error has we have a problem connecting 2 the server ! why is that:S i use the internet and do all my work on it everything works but only my amsn doesnt! plz help !!