port forwarding isn't a function or dependant on the type of connection. If it has indeed been implemented properly, it must work in all sorts of connections viz. PPPoE, bridge et al. Junkie, I suspect a rat in the utorrent settings. Try randomising the port everytime. As you mentioned, UPnP is also enabled, this must be IT. Are you running any firewalls? Like zonealarm? IF u do, start utorrent and wait till it turns green and only then start the firewall.