Flexman said this on www.simhq.com about getting MP camapigns to work
Here's workaround for the screwed multiplayer that may work for you:
1) Run with the command line cvc:0 on both machines.
2) And or try running with command line switch cto:240 also on both machines.
It seems the anti-cheat comms validation is at fault. So the above may help get around it.
Needless to say, a proper fix will be made at a later date.
And this from
FOLKS: There seems to be a problem with the SKIRMISH patch! I am not able to fly multiplay at all, and the emails are pouring in saying the same thing.....so don't download it, and hopefully we will hear something quickly from Razorworks.
[This message has been edited by Spawnbob (edited 05-25-2000).]