string address_TCP = "net.tcp://192.168.1.2:8002/MyService";

        EndpointAddress e_address = new EndpointAddress(address_TCP);

        NetTcpBinding tcpb = new NetTcpBinding();

        tcpb.Security.Mode = SecurityMode.Transport;
        tcpb.Security.Transport.ClientCredentialType = TcpClientCredentialType.Windows;
        tcpb.Security.Message.ClientCredentialType = MessageCredentialType.Windows;
        tcpb.Security.Transport.ProtectionLevel = System.Net.Security.ProtectionLevel.EncryptAndSign;

        MyServiceClient client = new MyServiceClient(tcpb, e_address);
        client.ClientCredentials.Windows.ClientCredential.Domain = "";
        client.ClientCredentials.Windows.ClientCredential.UserName = "Vasya";
        client.ClientCredentials.Windows.ClientCredential.Password = "12345";