Multiplay: Client can't connect to Server since upgrade to Unity 6

Unity Engine
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1

Hey guys,

I have a project using Matchmaker and Multiplay Hosting and everything worked fine using Unity 2022.3 but since i switched to Unity 6 the clients can’t connect to the server. The Matchmaking seems to work fine and the client receives the correct ip and port to connect to the server. NetworkManager.StartClient() also returns true but then nothing happens and it times out.

The last log on the server is “[Netcode] Initialize” from the NetworkManager.

I’m also listening to NetworkManager.OnTransportFailure and UnityTransport.OnTransportEvent on the server but don’t get any notifications from there.
NetworkServer.ApprovalCheck() also never gets called according to the server logs.

I’m not sure what exactly is going wrong, does anyone have an idea?

Thanks for your help!