My brother can't host a mission for our friends, but I can. Port forwarding is set up exactly the same for both of us. Eventually I figured out the problem. Even though he selects 'Internet' as the HOST mode, his session gets hosted via LAN. Can anyone tell me why this is happening or, even better, how to fix this? His PC is a lot better than mine, so it would be nice if he could host the missions. Thanks in advance! Epic_Tuna

Using belbo's code in 2017 and it's working great. I'd been trying to share objects between Zeus players for a long time until I found this. Thank you!