client activated object in .Net remoting

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C#3.5

remoting

Hi there
I implemented a server/client app in c# that use .net remoting for communication between the clients and server. I use the client activated object in the server side because I want the server save the states of each clients.
I configure the TCP channel and register the remote object in the server. Now I want that in the server use the data that calculated in clients.
I use the following code in the server:

RemotingConfiguration.Configure("Server.exe.config", true);
var remoteObj = Activator.GetObject(typeof(RemoteObject), "tcp://localhost:6791/Callback") as RemoteObject;
if (remoteObj != null)
{
    // When I run the server, this line throw an exception
    // The error msg is: Requested Service not found
    remoteObj.AgentAdded += remoteObj_AgentAdded;
}

I use the following code in client side:

RemotingConfiguration.Configure("Client.exe.config", true);
var remObj = new RemoteObject();

remObj.Add("Agent 1"); // The Add method fire the AgentAdded event

How can I do this?
thanks