Unable to join session for Steam

Development Platform & Builds
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1

We cannot get the Steam subsystem to work properly for our game. We can find sessions but on join nothing happens. The logs during the process are as follows:

[2021.10.27-14.02.19:631][403]LogBlueprintUserMessages: [W_Multiplayer_Submenu] Searching for sessions...
[2021.10.27-14.02.19:937][448]LogOnlineSession: STEAM: Found 1 lobbies, finalizing the search
[2021.10.27-14.02.19:937][448]LogOnlineSession: STEAM: Search result 0: LobbyId=Lobby[0x18600000078E86E], LobbyId.IsValid()=true, CSteamID(LobbyId).IsLobby()=true
[2021.10.27-14.02.19:938][448]LogScript: Script Msg: Found a session. Ping is 9999
[2021.10.27-14.02.20:298][500]LogBlueprintUserMessages: [W_Multiplayer_Submenu] Found Session ID: 109775240925079662 Build ID:17155196
[2021.10.27-14.02.20:299][500]LogBlueprintUserMessages: [W_Multiplayer_Submenu] Found 0 sessions!
[2021.10.27-14.02.38:510][ 19]LogOnlineSession: Warning: STEAM: Can't destroy a null online session (GameSession)
[2021.10.27-14.02.38:510][ 19]LogBlueprintUserMessages: [W_SessionEntry_C_0] no session to destroy
[2021.10.27-14.02.38:796][ 61]LogOnlineSession: STEAM: Using P2P Data for Connection Serialization
[2021.10.27-14.02.38:796][ 61]LogOnlineSession: OSS: Join session: traveling to steam. :7777
[2021.10.27-14.02.38:796][ 61]LogBlueprintUserMessages: [W_SessionEntry_C_0] join successful!
[2021.10.27-14.02.38:802][ 61]LogNet: Browse: steam.76561198106247762/Game/Maps/Medieval/Map_WorldLandscape
[2021.10.27-14.02.38:802][ 61]LogNet: Display: SteamNetDriver_0 bound to port 7777
[2021.10.27-14.02.38:802][ 61]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2021.10.27-14.02.38:802][ 61]LogOnline: STEAM: Adding user 76561198106247762:7777 from RegisterConnection
[2021.10.27-14.02.38:802][ 61]LogNet: Game client on port 7777, rate 100000
[2021.10.27-14.03.38:816][635]LogNet: Warning: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.01, Real: 60.01, Good: 60.01, DriverTime: 60.01, Threshold: 60.00, [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.10.27-14.03.38:816][635]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionTimeout, ErrorString = UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.01, Real: 60.01, Good: 60.01, DriverTime: 60.01, Threshold: 60.00, [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID, Driver = PendingNetDriver SteamNetDriver_0
[2021.10.27-14.03.38:816][635]LogNet: Warning: Network Failure: PendingNetDriver[ConnectionTimeout]: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.01, Real: 60.01, Good: 60.01, DriverTime: 60.01, Threshold: 60.00, [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.10.27-14.03.38:816][635]LogNet: NetworkFailure: ConnectionTimeout, Error: 'UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 60.01, Real: 60.01, Good: 60.01, DriverTime: 60.01, Threshold: 60.00, [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID'
[2021.10.27-14.03.38:816][635]LogNet: UNetConnection::Close: [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID, Channels: 2, Time: 2021.10.27-14.03.38
[2021.10.27-14.03.38:816][635]LogNet: UChannel::Close: Sending CloseBunch. ChIndex == 0. Name: [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.10.27-14.03.38:816][635]LogNet: DestroyNamedNetDriver SteamNetDriver_0 [PendingNetDriver]
[2021.10.27-14.03.38:817][635]LogExit: PendingNetDriver SteamNetDriver_0 shut down
[2021.10.27-14.03.38:823][636]LogNet: Browse: /Game/Maps/Medieval/Map_WorldLandscape?closed
[2021.10.27-14.03.38:823][636]LogNet: Connection failed; returning to Entry
[2021.10.27-14.03.38:824][636]LogLoad: LoadMap: /Game/Maps/Medieval/Map_WorldLandscape?closed
[2021.10.27-14.03.38:824][636]LogWorld: BeginTearingDown for /Game/Maps/Map_PersistentLevel
[2021.10.27-14.03.38:825][636]LogWorld: UWorld::CleanupWorld for Map_PersistentLevel, bSessionEnded=true, bCleanupResources=true
[2021.10.27-14.03.38:825][636]LogSlate: InvalidateAllWidgets triggered.  All widgets were invalidated
[2021.10.27-14.03.38:825][636]LogWorld: UWorld::CleanupWorld for Map_Framework_Menu, bSessionEnded=true, bCleanupResources=true
[2021.10.27-14.03.38:825][636]LogSlate: InvalidateAllWidgets triggered.  All widgets were invalidated
[2021.10.27-14.03.38:852][636]LogNet: UChannel::CleanUp: ChIndex == 0. Closing connection. [UChannel] ChIndex: 0, Closing: 0 [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: SteamNetConnection_0, Driver: PendingNetDriver SteamNetDriver_0, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.10.27-14.03.38:854][636]LogAudio: Display: Audio Device unregistered from world 'None'.
[2021.10.27-14.03.38:854][636]LogNet: UNetConnection::PendingConnectionLost. [UNetConnection] RemoteAddr: 76561198106247762:7777, Name: None, Driver: PendingNetDriver None, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: INVALID bPendingDestroy=0 
[2021.10.27-14.03.38:854][636]LogOnline: STEAM: Removing P2P Session Id: Dan [0x110000108B38252], Channel: 7777, IdleTime: 60.052

The DefaultEngine is set up as follows and we are using a custom steamappid, not the default Spacewar 480 test ID:

[OnlineSubsystem]
;DefaultPlatformService=Null
DefaultPlatformService=Steam
PollingIntervalInMs=20
VoiceNotificationDelta=0.2
bHasVoiceEnabled=true

[OnlineSubsystemSteam]
bEnabled=true
SteamAppId=480
SteamDevAppId=480
GameServerQueryPort=27015
bRelaunchInSteam=false
GameVersion=1.0.0.0
bVACEnabled=1
bAllowP2PPacketRelay=true
P2PConnectionTimout=90

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"
AllowDownloads = false

We also tried both using the built-in nodes for handling sessions and the AdvancedSessions plugin. Neither has worked/went any further than this.

3

There’s some info available online that Steam Subsystem is broken in 4.27. I can’t even create a Steam session in 4.27, whereas in 4.26 everything works just fine. Can you show the code / BP where you create sessions? I’m curious how you got that to work.

4

Looks like you forgot this in DefaultEngine.ini

[/Script/Engine.GameEngine]
+NetDriverDefinitions=DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")