The situation is the following:

I am the player A, and I'm virtually flying with Player B. We use both FS2004 and FSUIPC, and connect our PCs over IP, no other host software. Sometimes I host the session or he is the host and I am the guest. Everything worked well in the past. And we used the FlightNavigator many years and could see each other on the map (aircraft with speed, altitude, etc.)

In the last years, I don't know why (change FS2002 -> FS2004, or firewall prefs or port issue?), only the host could see both players on the FSNavigator & the other player only his own aircraft. In oder to enhance the situation we both installed Plan-G3 and I licensed WideFS so we hoped to see both planes again but as we recently tried, it did not work (each of us can only see his own aircraft).  No clue why.

I hope I was clear enough â€" that's the issue I try to solve.

thanks, I will test it (although I never needed it in the past 10 years) but it's hard to find on the web... the link on the Dowson's
FSUIPC site is dead and a lot other I got from Google search (for AIBridge 2.1 or even 3) as well. It seems to be totally obsolete!

Hosting a multiplayer connection with my IP, my aircraft is shown on Plan-G3 but not the aircraft of another guest using my session...
I use registered a version of FSUIPC and WideFS (for FS9).
What's wrong?

Thanks
YEC