First, I'm really sorry for my bad english. I'm French, and I don't speak English. So, sorry.
I try to connect at all public server, but, every time, I have this message : "Couldn't establish network communication with server."
I open the following port, and shutdown firewall and antivirus, but doesn't work.
I search, and I try all solution, but I don't understand.
So, I need your help !
Edit : I think i resolved my issue. I turn my modem (box internet ? or another in English) routeur -> Bridge, and multiplayer server work.