None of the solutions work at all. Clients will not enter same room. 4.17.2

Fresh created Third Person Template. Number of players set to 2.

This is the arguments I used
D:\UE_4.17\Engine\Binaries\Win64\UE4Editor.exe C:\Users\David\Documents\CPP_Project\CPP_Multiplayer\CPP_Multiplayer.uproject /Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap ?listen -server -log

D:\UE_4.17\Engine\Binaries\Win64\UE4Editor.exe C:\Users\David\Documents\CPP_Project\CPP_Multiplayer\CPP_Multiplayer.uproject /Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap 24.144.32.53:7777 -game

I get 0 warnings or errors. It just doesn’t connect the two players to the same room, ever. PIE works fine.

I don’t think you want the map in the second command. The ip address takes the place of the map.

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remove the Map location for the client. IP for you should be 24.144.32.53:7778 -game

7777 is the game port but the server is listening to 7778. The server log will give that as the listening port. I had the same problem until I added 7778.