silverlight username password authentication

Question

I am pass the username and password from my Silverlight 4 app to the a wcf service.

On the server side, the binding is setup as follows:

NetTcpBinding netTcpBinding = new NetTcpBinding(SecurityMode.Message, true); netTcpBinding.Security.Message.ClientCredentialType = MessageCredentialType.UserName; netTcpBinding.Security.Transport.ClientCredentialType = TcpClientCredentialType.None;

and on the client side, I setup the client credentials and then call the web service:

BinaryMessageEncodingBindingElement binaryMessageEncoding = new BinaryMessageEncodingBindingElement();

TcpTransportBindingElement tcpTransport = new TcpTransportBindingElement(); binding = new CustomBinding(binaryMessageEncoding, tcpTransport);

proxy = new MyWebClient(binding, address);

proxy.ClientCredentials.UserName.UserName = "admin";

proxy.ClientCredentials.UserName.Password = "password";

proxy.Hello();

In the service's Hello() method, I retrieve the username passed from the client using the OperationContext.Current.ServiceSecurityContext.PrimaryIdentity.Name. However, ServiceSecurityContext.Current is NULL.

What am I doing wrong?