X-Plane 11ΒΆ
This game is plug-and-play. No setup required.
You can use this guide to verify the settings:
Open the Settings window
Open the Network tab
Expand the UDP PORTS section on the right
Verify that Port we receive on (legacy) is set to
49000
:

Verify that Accept incomming connections is enabled at the bottom of the screen:

Restart X-Plane if any changes were made
Done