Flight Simulator X multiplayer hosting problem.

When I host a multiplayer session on Microsoft Flight Simulator X no one
joins my session. I asked a friend to check my ping and he said it was -1 and
in the red. Now I've been usings ports for my router that people have
suggected and from portforwarding.com and my ping is still red and -1. I've
tried everything! I've tried DMZ, portforwarding, changed windows firewall to
allow FSX, I have even turned the firewall off and my ping is still the same!
Every other game that I have port forward are working great and FSX is not!
Am I doing something wrong or is their more to it? If you can please help me
out with this problem that would be great. Thanks

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