I just tested it with the logs.
This is what happens when i start the lobby as listen server.
&stc=1
Maybe it’s my firewall blocking the port.
Edit
Nope, it’s not my firewall.
Maybe i do have to open a session first.
Edit
Open a session first doesn’t fix it.
Edit
Hallelujah, i think i fixed it.
the defaultengine.ini Onlinesubsystem Sections has to be in this exact order.
[/Script/Engine.GameEngine]+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")
[OnlineSubsystem]
DefaultPlatformService=Steam
PollingIntervalInMs=20
[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480
GameServerQueryPort=27015
bRelaunchInSteam=false
GameVersion=1.0.0.0
bVACEnabled=1
bAllowP2PPacketRelay=true
P2PConnectionTimeout=90
[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"
Now it gives me what i want.
&stc=1
edit
Only the session creation works now, but not joining.
The client joining the server still does the failed to bind to port 0 error.