The listening port should be the same as the port that was forwarded.

You could take a note of all your option settings, then delete your FW prefs folder whilst it's closed; How to delete your FrostWire Preferences folder

Then set up the firewall options again. I'm not sure why you wouldn't be sure which one FW was listening thru. You set this so it's static. Only if you're using UPnP (no port forwarding) would the UDP vary at all. But it looks like your device doesn't support UPnP. BTW when you port forwarded, did you set up a static ip 1st? If not, then you'd need to start from scratch & do the port forwarding again.