What is the correct WCF net.tcp binding security for this scenario?

Question

Hi guys. I have a WCF service which is hosted in a Windows Service and has net.tcp endpoint. The clients are in the same LAN (Workgroup) as the service but they don't have the server's Windows user accounts.

PS: When I set the Security.Mode to None in both client and server, I receive the following error:

The requested upgrade is not supported by '{SERVICE ADDRESS}'This could be due to mismatched bindings (for example security enabled on the client and not on the server).

Answer 1

Nettcp binding is secure by default, your clients must provide Windows credentials because all messages are signed and encrypted over tcp. Setting it to none will probably cause a problem, you'll want something like:

<netTcpBinding>
     <binding name="netTcp">
       <security mode="Transport">
         <transport clientCredentialType="Windows" />
       </security>
     </binding>
</netTcpBinding>

Answer 2

OK, I solved the problem.

I don't know why it is like this, but if I uncheck the "Use simple file sharing" in Folder Options of the server, everything works perfectly.