uhm also:
It does work with ipv4 in my case, if you disable peer-to-peer on the headless client

Hey guys, sorry for the late reply. Here are the logs.
Client A connected first to the headless client, no problem, then client B tried and failed. Then I stopped all the clients and copied the logs. All shoul be on verbose. Version of the game is 0.12.33 Build 18092

We switched to use IPv6 onyl and that works with the all the clients, so I am pretty sure the problem is at the providers side. The clients IP4 address is shared by multiple users.
But I will still try to get the logs this week.

I also noticed that clients with face ip4 pub addresses have often problem connection to a running game. What are fake ipv4 addresses: they actually only have a ipv6 address, but the provider does a ipv6 to ipv4 tunneling, so that they still have an ipv4. Problem is, that this ipv4 Address is shared...

Hi, i got pretty much the same problem here. One headless "server". Runs on linux as a hosted server, no firewall whatsoever. It has a public IPv4 Address. I have 3 different clients connection. Each each of those on different locations, networks etc. But all with LAN addresses behind a ro...