[tor-relays] setting up a bridge - troubleshooting

[Kathryn Cramer]

I am trying to set up a Bridge on a Mac running OSX 10.5.8 and using a
Trendnet Wireless Broadband router. UPnP is enabled. Clicking Test on
the Vidalia Settings menu yields the message "Failed to add a port
mapping."

There is a menu on the router software entitled Gaming which is the
only place I can find that allows setting of ports. I tried using that
to configure the port forwarding needed by the router, but that didn't
work. (It looks like this:
http://screenshots.portforward.com/TRENDnet/TEW-631BRP/Gaming.htm ) It
is described by the manufacturer as follows: "This option is used to
open multiple ports or a range of ports in your router and redirect
data through those ports to a single PC on your network. This feature
allows you to enter ports in various formats including, Port Ranges
(100-150), Individual Ports (80, 68, 888), or Mixed (1020-5000, 689)."

Ideas?