Hi, I've posted this on the Unreal forums as well so if I get an answer there I will post it here. I've been developing a VR demo in Unreal 4.22 for the Quest for about a month with great success. It is a multiplayer shooter and I've been hosting on the Quest or Vive and have tested with 4 players, everything's great, until... Randomly about a week and a half ago, for some reason the Join Session node is not allowing the client to connect to the listen server anymore. When the client calls Join Session after finding the server, the Join Session node fire off and complete off the success pin as if everything is fine! except nothing happens... I also setup a test in 4.23( of course following the instructions on this site) and am experiencing the same issue or issue where I connect to the listen server but it isn't the same instance of the server as the players cannot see each other inside the level. Has something changed recently regarding networking on the Quest? Is anyone else having multiplayer issue in Unreal recently? I feel like something changed and I just don't know about it.

Hi, try my solution for this. Waiting for being approved by oculus but helped many people (including myself xd).https://github.com/Oculus-VR/UnrealEngine/pull/154

I should add that in the Unreal editor player, I am able to simulate 2 or more players successfully finding and joining each other with no issues, so the core functionality is working and hasn't changed in the last several weeks.Some more testing showed that, in UE4.23, when I built out to Windows Vive/Rift, I could host a server on my PC and join with two other Quests with no issues. It was only when hosting on the Quest that restricted other players from joining. In 4.22 this is not an issue as I can host from the Quest and join with other Quests and Vive/Rift. I'm stuck.Thanks for your time.

Just adding: We are using Join and Invite in ue4.22 oculus integration. So far it works almost all the time. Oculus integtation is a must if you are not using it.

Thanks! I will look more into Oculus integration. It was my understanding that it was already included with UE4 and the Oculus VR plugin but I could be wrong. Everything in 4.22 is working fine for me too, it's 4.23 that I can't get the Quest to host a server that others can actually join, unless I host it from a PC, then other Quests can connect...

Are you using the Oculus Platform-tools with a valid Quest API key or did you got another way for the multiplayer?I just can't seem to get multiplayer working with the Quest and using UE4.

Unreal Multiplayer issue Joining Session | Meta Community Forums

25 Replies

evgeny.oculus
Protege
10 months ago
Any solution in 2025?
staniekmarcin
Protege
4 years ago
Hi, try my solution for this. Waiting for being approved by oculus but helped many people (including myself xd).
https://github.com/Oculus-VR/UnrealEngine/pull/154
- jose_jaramillo
  Explorer
  4 years ago
  Didn't work.
  
  I included this line in the AndroidEngine.ini in Config\Android
  
  [OnlineSubsystem]
  DefaultPlatformService=Oculus
  
  and it stopped crashing, but it won't travel to the server's map.
  - AdamUE4
    Honored Guest
    3 years ago
    Were you ever able to get this working? I've also been trying for weeks now and am starting to think it's not possible in 4.26
jose_jaramillo
Explorer
4 years ago
Hello everyone.

Has anyone happen to make this work? I've been trying to make this work for about 2 weeks and I'm still in the same spot: I can create a session, a client CAN find that session but CANNOT join it properly. If I build using the installed version of UE 4.27, the client joins the session, but it just stays there waiting, no travelling to the listen server map. If I build using the UE 4.27 source, the clint finds the session, but when trying to join, it crashes...

I also tried modifying the OculusNetDriver.cpp and IPAddressOculus.h, but there is no difference.

It's making me crazy jajaja

Thank
VintageGreen
Adventurer
4 years ago
Join Session still not working after removing steam vr and steam advanced sessions and making sure the project matches the dependencies for .uproject and .ini files etc.. from unreal sample but using OSS oculus bp and join session doesn't find the correct map on the host VR headset still over matchmaking pool but its always joining but not traveling even with turtle rock fixes applied and all sorts of crazy setting changes
VintageGreen
Adventurer
4 years ago
I've done 3 weeks of 24/7 testing, Join Session does not work atm, please need a solution or fixed source
VintageGreen
Adventurer
4 years ago
Still can't get it working I've copied all of the .uproject .ini etc.. info from the sample project and now my app is crashing on the headset

Working again after rolling back and resetting and rebuilding project
disabling steamVR caused crashing but deleting intermediate folder etc. and rebuilding fixed it
VintageGreen
Adventurer
4 years ago
Join session doesn't work finds wrong map or doesn't see map hosted set to listen.

Headset #1

[2021.05.14-12.16.46:220][ 88]LogBlueprintUserMessages: [VRGameInstance_C_2147482596] Created Session Successful!
[2021.05.14-12.16.46:221][ 88]LogGameMode: Display: Match State Changed from InProgress to LeavingMap
[2021.05.14-12.16.46:221][ 88]LogGameState: Match State Changed from InProgress to LeavingMap
[2021.05.14-12.16.46:221][ 88]LogNet: Browse: /Game/VirtualRealityBP/Maps/map2?listen
[2021.05.14-12.16.46:231][ 88]LogHMD: FSplash::DoShow
[2021.05.14-12.16.46:231][ 88]LogLoad: LoadMap: /Game/VirtualRealityBP/Maps/map2?listen
[2021.05.14-11.24.11:314][815]LogWorld: Bringing World /Game/VirtualRealityBP/Maps/map2.map2 up for play (max tick rate 0) at 2021.05.14-07.24.11
[2021.05.14-11.24.11:315][815]LogWorld: Bringing up level for play took: 0.007358
[2021.05.14-11.24.11:355][815]LogOnlineIdentity: Display: OSS: FOnlineIdentityGooglePlay::GetPlayerNickname
[2021.05.14-11.24.11:356][815]LogOnlineVoice: Oculus: Stopping networked voice for user: 0
[2021.05.14-11.24.11:356][815]LogGameMode: Display: Match State Changed from EnteringMap to WaitingToStart
[2021.05.14-11.24.11:356][815]LogGameState: Match State Changed from EnteringMap to WaitingToStart
[2021.05.14-11.24.11:356][815]LogGameMode: Display: Match State Changed from WaitingToStart to InProgress
[2021.05.14-11.24.11:362][815]LogGameState: Match State Changed from WaitingToStart to InProgress
[2021.05.14-11.24.11:362][815]LogHMD: FSplash::OnPostLoadMap Hide Auto Splash
[2021.05.14-11.24.11:363][815]LogLoad: Took 0.487080 seconds to LoadMap(/Game/VirtualRealityBP/Maps/map2)

Headset #2

[2021.05.12-02.27.18:202][432]LogOnlineSession: OSS: Join session: traveling to 3928780467239151.oculus [2021.05.12-02.27.18:203][432]LogGameMode: Display: Match State Changed from InProgress to LeavingMap [2021.05.12-02.27.18:203][432]LogGameState: Match State Changed from InProgress to LeavingMap [2021.05.12-02.27.18:203][432]LogNet: Browse: 3928780467239151.oculus/Game/VirtualRealityBP/Maps/Map1
[2021.05.12-02.27.18:204][432]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2021.05.12-02.27.21:288][709]LogSlate: Slate User Unregistered. User Index 8
[2021.05.12-02.27.21:289][709]LogSlate: Slate User Destroyed. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.21:289][709]LogSlate: Slate User Unregistered. User Index 8
[2021.05.12-02.27.23:906][944]LogSlate: New Slate User Created. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.23:906][944]LogSlate: Slate User Registered. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.27:738][288]LogOnlineSession: Warning: Oculus: Session (GameSession) already exists, can't join twice

Why is the other headset always joining but trying to load a map that it can't load?

Server browser will show two players in the game, but the headset trying to join does nothing after a while it reloads the default map after it fails to join the wrong map.

The other headset will always see the other headsets ID, Player count set. But it wont see the correct map loaded and hosted and set to listen?
VintageGreen
Adventurer
4 years ago

[2021.05.12-02.27.18:202][432]LogOnlineSession: OSS: Join session: traveling to 3928780467239151.oculus [2021.05.12-02.27.18:203][432]LogGameMode: Display: Match State Changed from InProgress to LeavingMap [2021.05.12-02.27.18:203][432]LogGameState: Match State Changed from InProgress to LeavingMap [2021.05.12-02.27.18:203][432]LogNet: Browse: 3928780467239151.oculus/Game/VirtualRealityBP/Maps/Map1 [2021.05.12-02.27.18:204][432]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2021.05.12-02.27.21:288][709]LogSlate: Slate User Unregistered. User Index 8
[2021.05.12-02.27.21:289][709]LogSlate: Slate User Destroyed. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.21:289][709]LogSlate: Slate User Unregistered. User Index 8
[2021.05.12-02.27.23:906][944]LogSlate: New Slate User Created. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.23:906][944]LogSlate: Slate User Registered. User Index 8, Is Virtual User: 1 [2021.05.12-02.27.27:738][288]LogOnlineSession: Warning: Oculus: Session (GameSession) already exists, can't join twice

it keeps trying to load the wrong level other headset
VintageGreen
Adventurer
4 years ago
This doesn't fix anything using 4.26 and the oculus build source of Unreal.
twistedpixel_bob
Expert Protege
6 years ago
I've been trying to resolve this issue. In the debugger, neither of those functions mentioned above is called when I try to join a session between a Quest and a Rift. ? Instead, it looks like it is calling FOnlineSessionOculus::GetResolvedConnectString().

In the StatelessConnectHandlerComponent::Tick, it just calls NotifyHandshakeBegin() over and over, and the state never changes to InitializedOnLocal. It never connects.