serious problem with online multiplayer server (global netwo

[mako]

I have a problem creating a server
Once I make a server, my friends try to enter but are expelled directly. they cannot enter, only one of my friends managed to enter, he was using the android version of the game.
But my friends who use the windows version, and linux, cannot enter to my server.
I clarify that this problem happens to all my friends, they are from Argentina. They tried to create servers too and we cannot enter the server they create. We can only enter the "Southland" server.
How can I solve this problem?
What router ports should be opened?

We have the latest version of the game, this problem happens when trying to create a server in the global network, for the local network if it works.
The operating system is windows 10.
Sorry for my bad English.

[benau]

you need to open 2759 port of router

actually you can use the "textgame" servers, any ping < 300ms is playable, as long as your network connection is stable