Not working in multi player

[Mr.Mike]

I am having an issue with a lot of my addon aircraft.  Some downloaded here "for fsx" some from other places.  

It seems FSX Multiplayer dosnt like my addon aircraft.  I can start a session with any thing but when loading into sessions already running I get to 86% on the loading screen then it boots me with an "unable to connect to host" message.  It always happens at 86%  I contacted microsoft on this and they were not help.  I have also posted this question on the HC forums and some people have the same problem but no answers.

So in short, any one heard of this and know a possible fix?

[eno]

It could be one of two problems .......
Does it only happen when using MP or during single play also?
Does it happen with both default and addon aircraft?

If it is in MP and single play then it's probably the addon aircraft or one of it's gauges causing the problem.
If it is only in MP then.....

It could be  a port problem..... are you on broadband or cable through a router?
Do you have a firewall running?

If so then you need to make sure that the correct ports are open to allow the sim to connect ..... likewise with the firewall.

Are you using Gamespy to connect? ...... if so then check any help pages there.
If you are using FShost .... or just connecting via IP .... then you need the module that allows you to connect from www.chocolatesoftware.com .

[Mr.Mike]

It happens in MP only.

I am useing cable modem with no router

It happens with most addon aircraft and none of the default ones

I have virus scan and fire walls off

I am connecting with game spy (is there a way to not connect with game spy?)

I'll check gamespy help and see what i can find

[Mr.Mike]

game spy offered little in the help section....