UE: How to Set Up a Listen Server
The simplest way to start a listen server is to create a desktop shortcut and change its target to UnrealEditor.exe MyProject.uproject ?listen -game.
To join, simply replace the ?listen launch argument with the IP address. Note that there is no - before it.
You can also connect through a listen server directly inside the editor.
The server command is open LevelName?listen.
The client command is open ServerIP.
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