OSS / OSS Steam fails to create server

Hi all,

New to development, not to unreal. Currently trying to make a small multiplayer game but I’m running into issues when trying to create a server to test the game locally (both Lan and Online).

Im currently setting this up using OSS / OSS Steam and have been following both the official documentation and tutorials on YouTube. I’ve redone the setup multiple times but I always get stuck at the same point; creating a server.

Whenever I set up a server I get a log error saying that the host closed the connection (I’ve attached logs so you can see the entire message) and the information I’m able to print returns and empty server name, 0/0 players (although the host actually connects to the level) and 9999 ping.
I’ve been running the game both standalone, as a listen server, as client, as a build. I’ve tried changing the port/address to something else than 17777. I’ve also done this on several different networks now - even in different countries… yes i’m quite serious about this lol

I’ve done the setup both with the blueprint setup that comes straight out of unreal as well as with the advanced sessions plugin and they all get the same result.

So im running out of ideas and solutions I’ve found on this forum.

I’m currently running unreal 5.4 on windows 64bit.

Has anybody encountered this ? Have any ideas what could be causing it ?

Much appreciated!!!


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