It's approved in my firewall I've made a port forward and I've made a fixed ip

And I get the same message from the game when I want to play with my friends

Every time I make a multiplayer game, I get this message (Failed to determine external ip address) and my friends can not join my game

But if my friend makes a game, I get this message (coud`t establish network commuication with server)


What should I do to get in and play with my friends again