UE4 Lan with Steam doesn't connect.

Development Platform & Builds
, , , , , ,
1

I’ve read other threads so what it seems so far is that Steam doesn’t support LAN sessions. However, line 774 of OnlineSessionInterfaceSteam is a function called FindLanSession() that gets called when I try and find a session.
And it does find the session, however when I try and join it it times out:

[2021.11.06-09.52.35:464][126]LogNet: Warning: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 20.02, Real: 20.02, Good: 20.02, DriverTime: 20.03, Threshold: 20.00, [UNetConnection] RemoteAddr: 192.168.0.49:7777, Name: SteamNetConnection_2147482455, Driver: PendingNetDriver SteamNetDriver_2147482456, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.11.06-09.52.35:464][126]LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionTimeout, ErrorString = UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 20.02, Real: 20.02, Good: 20.02, DriverTime: 20.03, Threshold: 20.00, [UNetConnection] RemoteAddr: 192.168.0.49:7777, Name: SteamNetConnection_2147482455, Driver: PendingNetDriver SteamNetDriver_2147482456, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID, Driver = PendingNetDriver SteamNetDriver_2147482456
[2021.11.06-09.52.35:464][126]LogNet: Warning: Network Failure: PendingNetDriver[ConnectionTimeout]: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 20.02, Real: 20.02, Good: 20.02, DriverTime: 20.03, Threshold: 20.00, [UNetConnection] RemoteAddr: 192.168.0.49:7777, Name: SteamNetConnection_2147482455, Driver: PendingNetDriver SteamNetDriver_2147482456, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2021.11.06-09.52.35:464][126]LogNet: NetworkFailure: ConnectionTimeout, Error: 'UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 20.02, Real: 20.02, Good: 20.02, DriverTime: 20.03, Threshold: 20.00, [UNetConnection] RemoteAddr: 192.168.0.49:7777, Name: SteamNetConnection_2147482455, Driver: PendingNetDriver SteamNetDriver_2147482456, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID'

One suggestion was to put Steam into ‘offline mode’ so that OnlineSubSystemNull is used but that doesn’t happen, it still uses OnlineSubsystemSteam.
Another suggestion was to run the game without Steam but that’s impossible to do if it was purched via Steam, as far as I know.

This is with SessionSearch->bIsLanQuery = true; in the FindSession code and SessionSettings.bIsLANMatch = true; in the CreateSession code.

Thanks.

2

I was having the same Steam timeout issue leading to client crash on join. This error appeared when testing PIE multi-player with lobby and server travel.

I am using a combination of Advanced Sessions for lobby and sessions and SteamCore to help with other functionality like leaderboards and statistics.

Running UE v4.26.x

For me the fix was to simply “NOT BE LOGGED INTO STEAM” + set the PIE launch to Standalone Game + NET MODE drop down select to “PlayStandalone”