WCFTestClient The HTTP request is unauthorized with client authentication scheme ‘Anonymous’

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I didn’t have control over the security configuration for the service I was calling into, but got the same error. I was able to fix my client as follows.

  1. In the config, set up the security mode:

    <security mode="TransportCredentialOnly">
  <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" />
  <message clientCredentialType="UserName" algorithmSuite="Default" />
</security>

  2. In the code, set the proxy class to allow impersonation (I added a reference to a service called customer):

    Customer_PortClient proxy = new Customer_PortClient();
proxy.ClientCredentials.Windows.AllowedImpersonationLevel =    
         System.Security.Principal.TokenImpersonationLevel.Impersonation;

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