Can`t connect to host. Client does not receive RPCs

I am trying to connect client (build) to host (editor) and it is not connecting and receiving any signals.

I also attach Debug.Log to OnClientConnectedCallback and OnClientDisconnectCallback.
When i host in editor it displays OnClientConnectedCallback message, but when i try to connect to the host from the client no message is shown, indicating connection was not made.
But, when i close the unity build (client) it shows that client was disconnected meaning it was connected before, but no callback was made on connection.

I was not experiencing this kind of problems before on lower level package versions and unity version.

Updated unity transport to 2.3, Netcode for Gameobjects is 1.9.1
Tried custom rpc, unity`s sync transform nothing is working.
Windows firewall was also turned off, Protocol is Unity Transport, UDP, Network prefabs list is custom, not the default one

You’re not testing from within the editor? With Unity 6 you can use Multiplayer Playmode, older versions have to resort to ParrelSync but that still outperforms making builds.

Without any code it’s hard to provide feedback but events not firing may be related to calling StartXxxx first and only afterwards registering for events.