I'm running x-wrt on a netgear r7000 and I have enabled UPnP on the device. However, I cannot get UPnP to work on any device. When i run a tester, the main error I receive is "GetExternalIPAddress" failed. I also notice the external IP address the router is reporting is 0.0.0.0. Is there something I can look at or a command I can run to fix this issue? Is it possible UPnP is bound to the wrong interface?