For the multiplayer connection the important points are:
* The outwards port needs to always be the same number (5000)
* The inbound port needs to be different for each instance (5000, 5001, 5002, ...)
* The callsign needs to be different (in the first 7 letters)
If any of the above aren't followed then one, or other of the instances will block the others and it will just not work.
e.g.
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fgfs [usual options] "--multiplay=out,mpserver01.flightgear.org,5000" "--multiplay=in,10,,5000" -callsign="player1"
fgfs [usual options] "--multiplay=out,mpserver01.flightgear.org,5000" "--multiplay=in,10,,5001" -callsign="player2"
fgfs [usual options] "--multiplay=out,mpserver01.flightgear.org,5000" "--multiplay=in,10,,5002" -callsign="player3"
I think the most I've ever had is about 9 at the same time...
There may be other considerations such as sharing FG_HOME