What about your Router?
What's brand, speed, is it wireless, does it have it's own firwall in it's firmware?
Are you in fact trying to get your local network to connect to WAN and the Disco Server or are you trying to run a multiplayer Freelancer game on LAN in your home without internet?
I am running a non-internet LAN server in my home
I will check the router's type...
I just thought it might be encryptedby the router, is that possible?