Can't connect to any Server....

[Gery]

i have a issue with the connection. Me and some frinds played 7dtd for a while on a game hosted by me. Now we have the problem that they cannot join my game anymore. Further i cant connect to any other server/game. I checked that Firewall is off on computer as well on router, i tryed to reinstall the game, i starte without anticheat, i deleted the former savegame and profiles and so on, but nothing helps!
I tried port forewarding, tried a dedicated server, deactivated NAT and EAC in serverconfig.xml and so on and so on...
One strange experience was that we tried to workaround the problem with no result somebody else joined my game...?

If i try to connect to a server it shows: "Connecting to server via NAT facilitator" ---> "Could not connect to server: connection failed"

As i tried tunneling throu VPN i was able to join other games but non of my friends can join our server/game...

I have absolutely no idea anymore...


Can somebody help me please?