Yet another "Port is closed" story. Been through the helpfiles, followed all the instructions about Port Forwarding, but still Transmission tells me it's a no-go. I have a Netgear router, with UpnP enabled, using the nightly build from 19th Feb. (Last night). Checked and unchecked "Automatically map port", and while the Message Log reads 'Port Forwarding successful', the red light tells me otherwise.
Log results:
2009-02-20 17:11:53 +0100 upnp.c:140 [Info] Port Forwarding (UPnP): Stopping port forwarding through "http://192.168.2.1:80/Public_UPNP_C3", service "urn:schemas-upnp-org:service:WANIPConnection:1"
2009-02-20 17:11:53 +0100 port-forwarding.c:101 [Info] Port Forwarding: State changed from "Forwarded" to "Not forwarded"
2009-02-20 17:11:58 +0100 upnp.c:175 [Info] Port Forwarding (UPnP): Port forwarding through "http://192.168.2.1:80/Public_UPNP_C3", service "urn:schemas-upnp-org:service:WANIPConnection:1". (local address: 192.168.2.2:50001)
2009-02-20 17:11:58 +0100 upnp.c:178 [Info] Port Forwarding (UPnP): Port forwarding successful!
2009-02-20 17:11:58 +0100 port-forwarding.c:101 [Info] Port Forwarding: State changed from "Not forwarded" to "Forwarded"
But what I see...

Any other details you need?