I am having a similar problem although the local port dialog looks normal. Worked a few days ago on 1.3.39. After update UDP connect no longer works. Firewall is disabled. Qgroundcontrol connects on the same ip addr / port combo.
Reverting to 1.3.39 doesn’t fix the problem in my case. I’m running 1.3.39 from a freshly unpacked zip file in a separate directory. For both 1.3.41 and now 1.3.39 I cannot cancel out of waiting for the UDP connection and need to restart Windows. The log shows a scrolling list of HUD messages as attached…
My problem has gone away. I renamed the Mission Planner folder in “My Documents” and restarted 1.3.41. It prompted to run the wizard as it thought it was a first time run. I cancelled this and tried to establish a UDP connection which is now working fine.