I bought a game to play with a friend in multiplayer.
When I try to join him an error pops up.
"could not connect to the server"

0.001 2019-02-26 15:46:31; Factorio 0.16.51 (build 36654, win64, steam)
0.001 Operating system: Windows 10 (version 1803)
0.013 Program arguments: "D:\Gry\Steam ...