Plutonium

Some really odd is happening then, feel free to drop me an @ on discord and I'll see what help I can offer you

Honestly just go through and double check everything is set correctly in the launcher and the dedicated.cfg and launch it.

How far away are you from each other? Cause that sounds like distance is more of an issue then anything else.

If you have any more issues shoot me an @ on discord and I'll see if I can offer some more help.

Make sure the person is on your friends list and just invite them to your private/custom game and it should work, don''t stress about UPNP anymore as it's dated for what it's for.

First remove your server key from your post, secondly, do you have a file in the t6 gamesettings folder called dm.cfg?

If you're trying to do a private match make sure your NAT Type is open.