Hosting Works, Joining Does not

[brittle dagger]

Howdy,
I have read the Hosting / Joining Sessions FAQ. I am able to host and travel to the map, though when it comes to joining that it fails.

In short pressing 1 works, pressing 2 displays all the valueble data, though never moves the player. I looked at the git commit and I believe I have the right information present. I have also ensured that the maps are properly added and that everyone is running the same .exe.

I would sincerely welcome any additional eyes on this. Thanks in advance.

I get this but it never travels.

Lecture 14 if that helps.

[brittle dagger]

I do get this from time to time Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp] [Line: 15999]
Couldn't spawn player:

0x00007ff7199cda54 MenuSystem.exe!UEngine::LoadMap() []
0x00007ff71996be94 MenuSystem.exe!UEngine::Browse() []
0x00007ff719a01846 MenuSystem.exe!UEngine::TickWorldTravel() []
0x00007ff718c2ea3d MenuSystem.exe!UGameEngine::Tick() []
0x00007ff719e4c0c5 MenuSystem.exe!FEngineLoop::Tick() []
0x00007ff719e5c9ac MenuSystem.exe!GuardedMain() []
0x00007ff719e5ca7a MenuSystem.exe!GuardedMainWrapper() []
0x00007ff719e5f772 MenuSystem.exe!LaunchWindowsStartup() []
0x00007ff719e6c684 MenuSystem.exe!WinMain() []
0x00007ff71e79a1aa MenuSystem.exe!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
0x00007ffb69f9259d KERNEL32.DLL!UnknownFunction []

I added an additional player start did not work, and I disabled windows firewall on both machines which also did not work. I am going to continue with the course. hopefuly this resolves. I also changed regions on both machines to a new one, did not resolve.

I did notice that sometimes, I would obtain a failure on connect string

void AMenuSystemCharacter::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type Result)
{
    if (!OnlineSessionInterface.IsValid()) { return; }

    FString(Address);
    if(OnlineSessionInterface->GetResolvedConnectString(NAME_GameSession, Address))
    {
        if (GEngine)
        {
            GEngine->AddOnScreenDebugMessage(-1,15.f,FColor::Yellow,FString::Printf(TEXT("Connect String: %s"), *Address));
        }
    }
    else
    {
        if (GEngine)
        {
            GEngine->AddOnScreenDebugMessage(-1,15.f,FColor::Red,FString::Printf(TEXT("FAILED TO OBTAIN CONNECT STRING")));
        }
    }

    APlayerController* PlayerController = GetGameInstance()->GetFirstLocalPlayerController();
    if (PlayerController)
    {
        if (GEngine)
        {
            GEngine->AddOnScreenDebugMessage(-1,15.f,FColor::Yellow,FString::Printf(TEXT("PLAYER CONTROLLER FOUND ATTEMPTING TRAVEL")));
        }
        PlayerController->ClientTravel(Address, TRAVEL_Absolute);
    }
}

For anyone curious enough to debug I will drop the files here.

[vital coral]

#🔫｜multiplayer-shooter message

If you are using 5.5 this is likely the fix.

[Unimportand rant] It appears epic's test no longer includes steam... as they removed SEARCH_PRESENCE but didn't give instructions on what to replace it with and just noted the EOS no longer supports it.

Although the issue is that for steam both bUsesPresence and bUseLobbiesIfAvailable have to have the same value
https://github.com/EpicGames/UnrealEngine/blob/1308e62273a620dd4584b830f6b32cd8200c2ad3/Engine/Plugins/Online/OnlineSubsystemSteam/Source/Private/OnlineSessionInterfaceSteam.cpp#L859C1-L864C3

but their latest update appears to flip bUseLobbiesIfAvailable somewhere..

[brittle dagger]

I'll try the buselobbies again, I neglected that but I believe. Give me a few.

[brittle dagger]

My apologies, I was already using this as you can see in this image

[vital coral]

You need to do it in void UMultiplayerSessionsSubsystem::JoinSession(const FOnlineSessionSearchResult& SessionResult)
Result.Session.SessionSettings.bUseLobbiesIfAvailable = true;

#🔫｜multiplayer-shooter message

[brittle dagger]

that appears to be plugin code, Not on the Character correct?

[vital coral]

Yeah it should be the plugin code

[brittle dagger]

right, I was having issues with the character. I have moved onto the plugin, hopefully I will stumble to needing that in a bit 😄

[vital coral]

Oh, I just read that you were having problems joining your hosted lobby

Looking through the images it appears to be the same as the plugin code anyhow

[vital coral]

It should slot into your 7th code image, before OnlineInterface->JoinSession()

[brittle dagger]

Thanks, I will keep plugging away till I get closer, I imagine by days end or tomorrow around 4 AM EST I should be at the end of Section 2. Then I will ping in ehre again 😄 ❤️

[urban linden]

I also had a problem joining sessions at around lesson 11 - 14. I only had the problem joining Steam sessions though. Joining LAN sessions worked for me. I'm using UE 5.5. What version are you using?

[brittle dagger]

5.5. I made it to lecture 18 at this time, just moving forward with the plugin. Hopefully it goes away, if it doesnt, I will have to implement your solve above.

[urban linden]

Yeah you just add that one line before you call the Join function. That's what solved it for me.

[brittle dagger]

awesome, I am glad there is a solve 😄

Cant wait till I get there 😄

Maybe tonight / tomorrow if I am lucky

[urban linden]

You don't need to wait for the plugin section. you can just use it now. I figured it out when I was at the character part. It's practically the same code you use in the plugin. At least the part where you search for sessions and join them.

[vital coral]

Yes, just add it in your AMenuSystemCharacter::OnFindSessionsComplete() before you call OnlineSessionInterface->JoinSession(), no need to wait, the plugin code will have the same logic flow

Result.Session.SessionSettings.bUseLobbiesIfAvailable = true;

[brittle dagger]

I think I got here now 😄

added this badboy

f yeah!

[vital coral]

Congratz, you may want to mark it as it probably should be removed later.

[brittle dagger]

Mark what?

[vital coral]

Result.Session.SessionSettings.bUseLobbiesIfAvailable = true;
Since it's probably a bug that they will fix

[brittle dagger]

void UMenu::OnFindSessions(const TArray<FOnlineSessionSearchResult>& SessionResults, bool bWasSuccessful)
{
    if (MultiplayerSessionsSubsystem == nullptr) { return; }
    
    for (auto Result : SessionResults)
    {
        FString SettingsValue;
        Result.Session.SessionSettings.Get(FName("MatchType"),SettingsValue);
        if (SettingsValue == MatchType)
        {
            Result.Session.SessionSettings.bUseLobbiesIfAvailable = true; // This line is a bug fix
            MultiplayerSessionsSubsystem->JoinSession(Result);
            return;
        }
    }

    if (!bWasSuccessful || SessionResults.Num() == 0)
    {
        JoinButton->SetIsEnabled(true);
    }
}

Thats how i have it

[vital coral]

I mean, something simple like:
// TODO: test & remove after update

Ahh

Yeah, you have it 😄

[brittle dagger]

Ill add a TODO: as well, since Rider catches those

man I love Obsidian 😄

[stark cobalt]

@hushed elm

[hushed elm]

Hey

[gaunt hearth]

Hello!!! Same problem here. The host is travelling to the lobby level, but when the other player try to join session, he is respawned in the same level.