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Impossible to find Steam Sessions when using Source Build in 4.20

I've made a build of the release branch from source, and when using this version of the engine I am unable to find any sessions. None of my session code has changed between the launcher and engine version, so something is amiss here. Using a launcher version of the engine results in this system working fine.

For a test project, you can use either ShooterGame or Multiplayer Shootout. Build a source version of 4.20 from the release branch and publish it to steam with a valid AppID. If one player hosts a match (via listen server), another player will NOT be able to find that match.

Forum thread is here, but this hasn't yet solved my problem: https://forums.unrealengine.com/community/general-discussion/1497867-steam-online-subsystem-not-finding-server-with-find-sessions-with-4-20

Product Version: UE 4.20
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asked Jul 24 '18 at 11:47 AM in C++ Programming

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TheJamsh
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avatar image TheJamsh Jul 24 '18 at 12:01 PM

Note - if I launch the game OUTSIDE of Steam (and ensure that the steam client is closed on both machines), the game will fallback to the IPNetDriver and I will be able to find sessions without any issues.

This is clearly an issue with the Steam Session Interface, which for some reason only occurs in a source engine build.

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