These are the ports I am trying to use with FSHost / P3D Multiplayer.
Managed to create FSHost and P3D servers and this works with V2.0 but not yet had a try with V2.1.
Port 81 is only for me to gain access to the FSHost Server.
Some of the ports are NOT required but hey, they say they want them so have them open.
Will give better feedback when I find time to try more.
Any tips from you chaps would be nice?