How to make WCF NetTcpBinding working with TLS

Question

I am new to WCF. I have a simple WCF Server/Ciient C# (Framwork 4.8) application that uses the NetTcpBinding protocol. The application sends a message to the Server, and Server returns the message back with a datetime stamp.

I need to make the application working with TLS.

Server:

host = new ServiceHost(typeof(MyService));

NetTcpBinding binding = new NetTcpBinding();

binding.Security.Mode = SecurityMode.Transport;

binding.Security.Transport.SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | 
SslProtocols.Tls;

host.AddServiceEndpoint(typeof(IMyService), binding, new Uri("net.tcp://localhost:8888/implementclass"));

host.Open();

Client:

NetTcpBinding binding = new NetTcpBinding();    

binding.Security.Mode = SecurityMode.Transport;

binding.Security.Transport.SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | SslProtocols.Tls; 

EndpointAddress epa = new EndpointAddress($"net.tcp://{txtIPAddress.Text}:8888/implementclass");

ChannelFactory<IMyService> chn = new ChannelFactory<IMyService>(binding, epa);

chn.CreateChannel();

ServiceContract:

[OperationContract]

string Send(string s);

When Client/Server run on two different computers ( Firewall is disabled on both), the following error appers:

The server has rejected the client credentials

The Client/Server work on the same PC installed. Also the Client/Server work when I am using unsecure connection:

binding.Security.Mode = SecurityMode.None

How to make the application working using the TLS protocol?

Answer 1

You can try set the ClientCredentialType property for Transport mode,and the following code sets the property to Windows.

NetTcpBinding binding = new NetTcpBinding();
binding.Security.Mode = SecurityMode.Transport;
binding.Security.Transport.ClientCredentialType =TcpClientCredentialType.Windows;

https://docs.microsoft.com/en-us/dotnet/api/system.servicemodel.nettcpbinding?view=dotnet-plat-ext-6.0

<security mode="Transport">
      <transport clientCredentialType="Windows" />
</security>

How to make the application working using the TLS protocol?
You can read the following articles:
Transport Layer Security (TLS) best practices with the .NET Framework
How to enable TLS 1.2 on clients