I can't play with my friends at grin dawn together, we have the latest version of the game that corresponds one of the two creates a multiplayer game we see the server we try to enter it, but the others can't enter it says impossible to connect, what's the problem ?



please help me

Check here to see if anything helps.

https://forums.crateentertainment.com/t/grim-dawn-common-issues-and-solutions/81943/3

Also do you all have exactly the same versions, i.e. base game, AoM or FG too. If one has the base game and the others have one or both expansions then I don't think you'd be able to crossplay. You could try either of these

https://forums.crateentertainment.com/t/play-with-friends-although-not-everybody-has-the-expansion-s/86357

https://forums.crateentertainment.com/t/tool-gd-switcher-v1-2/51259

but I don't know if they'd work for the GOG version of the game to allow crossplay.