How to properly send message and register for message ?

Hello,

I am getting a message like that, and i use the NetworkMessage to send back to sender a message:

Code (CSharp):

1.  
2.  
3.         protected virtual void OnGameServerRegistered(NetworkMessage netMsg)
4.         {
5.             var msg = netMsg.ReadMessage<RegisterGameServerMessage>();
6.             if (msg != null)
7.             {
8.                      var createdRoomId = new RequestSetRoomIdOnGameServer ();
9.                     createdRoomId.roomId = gameServerId
10.                     netMsg.conn.Send(MatchmakingNetworkProtocol.RequestSetRoomIdOnGameServer, createdRoomId);      
11.             }
12.        }
13.  

Then on the other side i do that

Code (CSharp):

1.  
2. NetworkServer.RegisterHandler(MatchmakingNetworkProtocol.RequestSetRoomIdOnGameServer, OnSetGameId);
3.  

But nothing reaches this place ...
What did i miss ?

Thx