A ConnectionRequestMessage was received from the server on the client side.

[Kartopod]

Description

I'm using the multiplayer play mode feature, and when I connect the client, this popped up:

[Netcode] A ConnectionRequestMessage was received from the server on the client side. This should not happen. Please report this to the Netcode for GameObjects team at https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/issues and include the following data: Message Size: 329. Message Content: 02 04 7d 9a e2 a5 01 7d 9a e2 a5 01 7d 9a e2 a5 01 7d 9a e2 a5 01 b2 36 17 b3 01 b2 36 17 b3 01 b2 36 17 b3 01 b2 36 17 b3 01 46 c4 ca 04 01 46 c4 ca 04 01 46 c4 ca 04 01 46 c4 ca 04 01 39 3b e8 2c 01 39 3b e8 2c 01 39 3b e8 2c 01 39 3b e8 2c 01 ab c9 50 60 01 ab c9 50 60 01 ab c9 50 60 01 ab c9 50 60 01 53 a3 38 44 01 53 a3 38 44 01 53 a3 38 44 01 53 a3 38 44 01 d3 f6 1c b8 01 d3 f6 1c b8 01 d3 f6 1c b8 01 d3 f6 1c b8 01 a6 22 89 97 01 a6 22 89 97 01 a6 22 89 97 01 a6 22 89 97 01 b5 fe 01 74 01 b5 fe 01 74 01 b5 fe 01 74 01 b5 fe 01 74 01 be 97 be 73 01 be 97 be 73 01 be 97 be 73 01 be 97 be 73 01 9d 9a 5c 01 01 9d 9a 5c 01 01 9d 9a 5c 01 01 9d 9a 5c 01 01 e9 51 97 17 01 e9 51 97 17 01 e9 51 97 17 01 e9 51 97 17 01 8a f7 e7 83 01 8a f7 e7 83 01 8a f7 e7 83 01 8a f7 e7 83 01 42 7f 88 c6 01 42 7f 88 c6 01 42 7f 88 c6 01 42 7f 88 c6 01 97 a3 f5 46 01 97 a3 f5 46 01 97 a3 f5 46 01 97 a3 f5 46 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 11 92 02 00 00 00 00
UnityEngine.Debug:LogError (object)
Unity.Netcode.NetworkLog:LogError (string) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Logging/NetworkLog.cs:34)
Unity.Netcode.NetworkManagerHooks:OnVerifyCanReceive (ulong,System.Type,Unity.Netcode.FastBufferReader,Unity.Netcode.NetworkContext&) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Messaging/NetworkManagerHooks.cs:91)
Unity.Netcode.NetworkMessageManager:CanReceive (ulong,System.Type,Unity.Netcode.FastBufferReader,Unity.Netcode.NetworkContext&) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Messaging/NetworkMessageManager.cs:325)
Unity.Netcode.NetworkMessageManager:HandleMessage (Unity.Netcode.NetworkMessageHeader&,Unity.Netcode.FastBufferReader,ulong,single,int) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Messaging/NetworkMessageManager.cs:407)
Unity.Netcode.NetworkMessageManager:ProcessIncomingMessageQueue () (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Messaging/NetworkMessageManager.cs:458)
Unity.Netcode.NetworkManager:NetworkUpdate (Unity.Netcode.NetworkUpdateStage) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Core/NetworkManager.cs:42)
Unity.Netcode.NetworkUpdateLoop:RunNetworkUpdateStage (Unity.Netcode.NetworkUpdateStage) (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Core/NetworkUpdateLoop.cs:185)
Unity.Netcode.NetworkUpdateLoop/NetworkEarlyUpdate/<>c:b__0_0 () (at ./Library/PackageCache/com.unity.netcode.gameobjects@1.6.0/Runtime/Core/NetworkUpdateLoop.cs:208)

Environment

• OS: Windows 11
• Unity Version: 2023.3.0a3
• Netcode Version: 1.6.0

[josephan]

I'm also facing this issue:

[Netcode] A ConnectionApprovedMessage was received from a client on the server side. This should not happen. Please report this to the Netcode for GameObjects team at https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/issues and include the following data: Message Size: 342. Message Content: 02 04 7d 9a e2 a5 01 7d 9a e2 a5 01 7d 9a e2 a5 01 b2 36 17 b3 01 b2 36 17 b3 01 b2 36 17 b3 01 46 c4 ca 04 01 46 c4 ca 04 01 46 c4 ca 04 01 39 3b e8 2c 01 39 3b e8 2c 01 39 3b e8 2c 01 ab c9 50 60 01 ab c9 50 60 01 ab c9 50 60 01 53 a3 38 44 01 53 a3 38 44 01 53 a3 38 44 01 d3 f6 1c b8 01 d3 f6 1c b8 01 d3 f6 1c b8 01 a6 22 89 97 01 a6 22 89 97 01 a6 22 89 97 01 b5 fe 01 74 01 b5 fe 01 74 01 b5 fe 01 74 01 be 97 be 73 01 be 97 be 73 01 be 97 be 73 01 9d 9a 5c 01 01 9d 9a 5c 01 01 9d 9a 5c 01 01 e9 51 97 17 01 e9 51 97 17 01 e9 51 97 17 01 8a f7 e7 83 01 8a f7 e7 83 01 8a f7 e7 83 01 42 7f 88 c6 01 42 7f 88 c6 01 42 7f 88 c6 01 97 a3 f5 46 01 97 a3 f5 46 01 97 a3 f5 46 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 00 00 00 00 01 aa 6f 88 95 7b c3 c0 31 08 00 00 00 6a a3 02 5e 01 00 10 01

Unity 2022.3.8f
NGO 1.6.0

[kevincastejon]

I encountered many issues with the multiplayer play mode, always resolved by restarting Unity... let's hope more stability in the future

[NoelStephensUnity]

@Karto1234
Can you provide a simple replication project for this issue?
Also, do you have domain reloading turned off?

[NoelStephensUnity]

@Karto1234
Are you using UnityTransport?

[Kartopod]

@Karto1234 Can you provide a simple replication project for this issue? Also, do you have domain reloading turned off?

Yes, i Believe I had domain reloading turned off, had to turn it back on for things to work.
Unfortunately i cannot provide a demo project since I've ditched using MPM for using parrelsync since stuff would still not work (The client wouldnt receive RPCs, etc).

I would also like to point out that it looks like disabling domain reloading completely breaks netcode for gameobjects in general since every time I hit play after script changes, (Even when using parrelsync) i get no errors, but nothing related to netcode works properly, and i will have to unplay and play a second time for things to work.

@Karto1234 Are you using UnityTransport?

Yes

[NoelStephensUnity]

@Karto1234
Yes, NGO uses IL-Code injection during the post processing phase of generating your project's DLL. This means that things like:

• RPCs: The attribute is found during ILPP and additional code is injected to handle the communication of the Rpc
• NetworkVariables
• Custom Serialization
• etc.

Generally speaking, if you make a netcode script related adjustment then you will want to reload your project's DLL as it will have changed. It isn't a bug, but it can be frustrating to find that out the way you did. We did have a section for the MPPM documentation that discussed domain reloading, but it appears that page is not longer valid....