Originally Posted by kernelpanic

That sounds like a port blocking/shaping problem.

When I entered this thread, I thought it might also be a lack of attractive naming, but if you're getting the hits and they fail, then its likely an issue with connectivity not traffic.

First, look at your firewall. It may be blocking the ports that you're trying to use to share. If changing firewall policy still doesn't fix it, then try changing the port that the program listens on (most P2P progs allow user customized ports). If that still doesn't work, chances are that your ISP is shaping traffic based on protocol. In that case, you'll have to give them a call or open a ticket.