Steam - Listen Server - UE 5.6 - Unable to Join

[The0cake]

Fix is to turn on Steam Sockets plugin, the answer by @Ninhow here:

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The build is pushed to Steam, my friends and I downloaded it and tested on our own individual accounts, which are all added to Steamworks. We are located in the same city. In version 5.5, everything works fine with the same setup. However, in version 5.6, even a clean project with just the multiplayer setup doesn’t work. The dedicated server seems to function properly — the problem persists only with listen servers, according to discussions in the Unreal Discord. Again, session creation works f…