[saltman]

what torrent client are you using? it may be that your client uses more than one port such as the basic bittorrent. If this is the case say it is using 6881-6884. If it makes a request on a port that is not forwarded correctly you would have the results you are seeing. Have you checked the client side. It sounds like you have the router side locked down. What port range is on the client on the pc and what port range is on the client range of the mac? They should match. Sorry if this is obvious just throwing it out there.