Does the router have a switch?
Are you firewalled or is it a NAT error ?

Open a port in the router between 50000 and 60000, then set up yer torrentprog to use the same port, if still problems; disable any upnp software...

Some apps req multiple connections, and do not work with NAT . Use the virtual server setup in your router; specify the port normally associated with an app as a 'Trigger Port', select the protocol type both as TCP and UDP, then enter the pub ports associated with the trigger port to open them for inbound traffic.

...and doublecheck that MS hasn't turned the wall on by itself...