For some users, Network problems will keep them from being able to connect properly to other players for multiplayer flying.
For these users the very first recommendation is to get your Teamspeak client software setup so that you can get on the Hovercontrol Voice Server and talk to another member, staff, or instructor pilot for advice on what might be the problem. At Hovercontrol we have seen and solved 1000s of connection problems. No need for you to waste too much time solving problems that others might be familiar with already.
This can happen in both FS2004 and FSX as well as when using the FSInn client software for the specialized Hovercontrol flight server.
This basic guide will show router ports that should be forwarded to your PC if you are having network port blocking problems.
FS2004 Direct Connect Multiplayer
Port: 6073 - TCP/UDP
Port: 23456 - TCP/UDP
FSX Using Gamespy
Port 6112 through 6122 - UDP
FSInn Client Software
Port 10239 - UDP
Information regarding properly forwarding ports using your particular router can often be found at the following website: