Is this still being investigated?
Suddenly having this issue myself, my buddy can't connect to my game, neither through LAN, nor internet, even though it worked just fine two days ago. Searched the whole web, tried every setting and idea I could find, we both got the same version, port forwarding is enabled, turning off the whitelist, deleting the VintageStoryData folder and reinstalling the game, nothing works. Other servers work fine for both of us, but private game no longer allows him to connect. Nothing has changed, nothing was updated, it just randomly decided to not work anymore.
