Hello
I am using UE 5.0.3 with OnlineSubsystemSteam. I am running my game on 2 separate PCs with 2 separate Steam accounts (Play Standalone from within the Editor).
I can host an online game on one PC and then see the session on the other PC when searching for the sessions. When I try to join the session, the game tries to open a connection between the two PCs (P2P), and I can see log entries being generated on both sides. However, connection never succeeds and eventually times out with many lines of
LogHandshake: Verbose: Initial handshake packet timeout - resending.
in the client’s log (the PC trying to join the session). Meanwhile on the server, I get multiple of these entries:
LogOnline: Verbose: STEAM: - Id: Nyle [0x110000153E1CF7E], Number of Channels: 0, IdleTime: 54.161
LogOnline: Verbose: STEAM: - Detailed P2P session info:
LogOnline: Verbose: STEAM: -- IPAddress: 192.168.0.39:60408
LogOnline: Verbose: STEAM: -- ConnectionActive: 1, Connecting: 0, SessionError: 0, UsingRelay: 0
LogOnline: Verbose: STEAM: -- QueuedBytes: 0, QueuedPackets: 0
Creating and joining a Steam-LAN session works properly (although I had to manually configure the network interface metric of my WAN interfaces in Windows settings for the broadcast to work and see the advertised LAN session).
This leads me to believe that it’s probably some networking issue on my side. But maybe one of you has had similar problems and found a solution.
What I tried so far:
- Firewall and Anti-Virus program disabled on both PCs
- Port 7777 (tcp+udp) forwarded in my router to the IP of the PC hosting the game (I think this shouldn’t be necessary when using Steam OSS)
- Connect to different networks (Laptop through mobile hotspot, so it is not in the same LAN)
- Tried hosting+joining in both directions
- Tried with my brother in a different household, same issue
- Configuring WAN interface to have highest priority in Windows (on both PCs)
Note: For inexplicable reasons (at least for me) it sometimes very rarely worked to connect (such as once at the start of the day, and then never again the rest of the day), but mostly it doesn’t work.
If there are any ideas or suggestions, I would be very happy to hear them :).
Edit: I should note that I have an older game (UE 4.22) with Steam integration, and there I can connect perfectly fine with both PCs. Is there something quirky going on with UE5’s Steam integration?
Cheers!