Bug Error: ArgumentOutOfRangeException: ArgumentOutOfRange_NeedNonNegNum Parameter name: count

I've been experiencing a crash when a client connects to a host. It's on the host end, and it appears to be happening when the client is connecting.

It's only started happening this week, and even though I've rolled back my code and scenes to last week's version, I'm still getting the crash. The code I'm using had been working on iOS, Android and Windows devices successfully for months.

I'm using relay with lobby. The lobby is created successfully on the host, and the client successfully receives the lobby code and relay connection data. However, once the client attempts to connect, I get this error on the host:

ArgumentOutOfRangeException: ArgumentOutOfRange_NeedNonNegNum
Parameter name: count
System.ArraySegment`1[T]..ctor (System.Byte[] array, System.Int32 offset, System.Int32 count) (at <697c5b3fd45741b99b7cab46a4b7b6ac>:0)
Unity.Netcode.Transports.UTP.BatchedReceiveQueue.PopMessage () (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.2.0/Runtime/Transports/UTP/BatchedReceiveQueue.cs:100)
Unity.Netcode.Transports.UTP.UnityTransport.ReceiveMessages (System.UInt64 clientId, Unity.Networking.Transport.NetworkPipeline pipeline, Unity.Networking.Transport.DataStreamReader dataReader) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.2.0/Runtime/Transports/UTP/UnityTransport.cs:787)
Unity.Netcode.Transports.UTP.UnityTransport.ProcessEvent () (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.2.0/Runtime/Transports/UTP/UnityTransport.cs:844)
Unity.Netcode.Transports.UTP.UnityTransport.Update () (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.2.0/Runtime/Transports/UTP/UnityTransport.cs:877)

Here's the code I'm using to connect:

Code (CSharp):

1.     async Task<Lobby> QuickJoinLobby()
2.     {
3.         if (loading)
4.             return null;
5.         try
6.         {
7.             loading = true;
8.             multiPlayer.AddLog("Searching for Game...");
9.             var lLobby = await Lobbies.Instance.QuickJoinLobbyAsync();
10.             if (ApplicationData.Debug)
11.                 multiPlayer.AddLog("Found " + lLobby.Name + " Key:'" + lLobby.Data[JoinCodeKey].Value + "'");
12.             var a = await RelayService.Instance.JoinAllocationAsync(lLobby.Data[JoinCodeKey].Value);
13.             if (ApplicationData.Debug)
14.             {
15.                 try
16.                 {
17.                     multiPlayer.AddLog("IpV4:" + a.RelayServer.IpV4);
18.                     multiPlayer.AddLog("Port:" + a.RelayServer.Port);
19.                 }
20.                 catch
21.                 {
22.                     multiPlayer.AddLog("Can't show connection data");
23.                 }
24.             }
25.             transport.SetClientRelayData(a.RelayServer.IpV4, (ushort)a.RelayServer.Port, a.AllocationIdBytes, a.Key, a.ConnectionData, a.HostConnectionData);
26.             multiPlayer.AddLog("Joining " + lLobby.Name);
27.             hosting = false;
28.             NetworkManager.Singleton.StartClient();
29.             Debug.Log("Started Client");
30.             loading = false;
31.             return lLobby;
32.         }
33.         catch (LobbyServiceException e)
34.         {
35.             Debug.Log($"No lobbies available {e}");
36.             loading = false;
37.             return null;
38.         }
39.     }

On the client, it happily shows to the "Started Client" in the log, but never gets to my OnClientConnectedCallback on either the host or the client.
On the host, I get a debug message from netcode saying: [Netcode] Client Connected


Here's the Network Manager setup:

And Unity Transport, during runtime:

And the Package Manager:


Also, Relay does appear to be up and running...


Any help would be appreciated! I'm starting to tear my hair out over this one!

 

Thank you @unity-justin! That has resolved the issue. However, I've had to downgrade back to the older version...

It worked for the Android and Windows builds, but I can't get an iOS cloud build going unless I use an older version of unity. I can't seem to get any builds going for iOS using any unity 2022.2.x. I have an issue which I'll post on the cloud build thread about that.

I also found what caused the issue in the first place. I was using unity 2022.2.5f1 for my dev environment. As of the start of the week, my cloud build switched to 2022.2.16f1 (as my settings are to use the latest 2022.2.x build) The issue seems to occur with this newer build using the older 1.3.1 version of com.unity.transport.

Since my iOS cloud build can't use the newer version of unity, I've now downgraded transport back to 1.3.1, and got my iOS and Windows builds to detect the current unity version (which I also downgraded back to 2022.2.5.f1)
So, now all my builds work, and connect seamlessly to each other as they previously did.

Once I get my iOS cloud build working again with 2022.2.x builds, I'll upgrade transport to the latest.