problems with radios - HELP!!!

[makalu]

Hey, I'm connected to the net by DSN and (if that is relevant) I'm using a router. My problem is that most of the radio stations i find on Shoutcast are not working. I don't get reports about any errors, Winamp informs me that is connecting, however he is not prebuffering. And than he displays title of the song currently played and everything seems just fine, but I can't hear anything. Why? Please help!