NetworkManager.OnClientDisconnectCallback is not called on the client that disconnects

[rCarleon]

To Reproduce

• subscribe to OnClientDisconnectCallback
• Start a server and a client
• Connect client
• Disconnect Client by stopping the client in the NetworkManager inspector (the stopping should not happen from server)
• OnClientDisconnectCallback is only invoked on Server

Actual outcome
OnClientDisconnectCallback is only invoked on the Server and not on the client that has disconnected

Expected outcome
OnClientDisconnectCallback should be invoked on the client that disconnects

Environment (please complete the following information):

OS: Windows 10
Unity Version: 2021.2.4f1
Netcode Version: 1.0.0-pre.4

[MiTschMR]

I have submitted a bug report for this, will update this post when I get an official response.

[ashwinimurt]

We have received the bug and will process it soon. Thank you!

[rCarleon]

I just noticed that the problem only occurs when the client disconnects itself. If the server kicks the client, the callback is called.

[DasOhmoff]

What is the status on this? Is this being worked on?

[MiTschMR]

I haven't yet received an answer from Q/A, case number is 1398927.

[ashwinimurt]

The bug report is still being processed. Sorry for the delay. I have asked the Customer QA teams to fast-track it.

[MiTschMR]

Issue is open: https://issuetracker.unity3d.com/issues/netcode-netcode-not-calling-the-method-when-closing-built-client

[ashwinimurt]

https://fogbugz.unity3d.com/f/cases/1398927/
Tracked in our backlog NCCBUG-128

[danielchipman]

This was originally reported for pre.4, however I observed this callback working correctly in pre.7 and pre.8. However, this seems to have been broken again with changes made to pre.9.

Worth noting that this will be invoked on clients when the server terminates the connection. The issue is specifically when the client calls Shutdown.

This is still broken in the recent 1.0 release.

[ashwinimurt]

Thanks for the update. I have reopened the bug internally for investigating.

[ashwinimurt]

@MiTschMR For the bug you filed https://issuetracker.unity3d.com/issues/netcode-netcode-not-calling-the-method-when-closing-built-client Please see my comments in the Resolution notes. It is slightly different from this particular issue.

@rCarleon This seems to be working as expected and is by design. The original implementation was that if the client side is shutting itself down, then it knows it is disconnecting. The event is to be notified when "the client or server have no way of knowing one or the other has disconnected".
Please refer to https://docs-multiplayer.unity3d.com/netcode/current/components/networkmanager/index.html#client-disconnection-notifications