<system.serviceModel>

    <services>

      <service behaviorConfiguration="MyServiceBehavior" name="MyService">

        <endpoint address="" binding="wsHttpBinding" contract="IMyService" bindingName="wsHttpEndpointBinding">

          <identity>

            <dns value="" />

          </identity>

        </endpoint>

        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />

      </service>

    </services>

    <behaviors>

      <serviceBehaviors>

        <behavior name="MyServiceBehavior">

          <serviceMetadata httpGetEnabled="true" />

          <serviceDebug includeExceptionDetailInFaults="true" />

        </behavior>

      </serviceBehaviors>

    </behaviors>

    <bindings>

      <wsHttpBinding>

        <binding name="wsHttpEndpointBinding">

          <security mode="TransportWithMessageCredential">

            <transport clientCredentialType="None" />

            <message clientCredentialType="UserName" />

          </security>

        </binding>

      </wsHttpBinding>

    </bindings>

  </system.serviceModel>

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <system.serviceModel>

    <bindings>

      <wsHttpBinding>

        <binding name="wsHttpEndpointBinding_IMyService">

          <security mode="Message">

            <message clientCredentialType="UserName" />

          </security>

        </binding>

      </wsHttpBinding>

    </bindings>

    <client>

      <endpoint address="http://localhost:2646/MyService.svc" binding="wsHttpBinding"

          bindingConfiguration="wsHttpEndpointBinding_IMyService" contract="ServiceReference1.IMyService"

          name="wsHttpEndpointBinding_IMyService">

        <identity>

          <dns value="" />

        </identity>

      </endpoint>

    </client>

  </system.serviceModel>

</configuration>

using (ServiceReference1.MyServiceClient client = new ConsoleApplication2.ServiceReference1.MyServiceClient ())

            {

                client.ClientCredentials.UserName.UserName = "abc";

                client.ClientCredentials.UserName.Password = "def";

 

                int summ = client.Summ (3, 4); // Ошибка

            }

Secure channel cannot be opened because security negotiation with the remote endpoint has failed. This may be due to absent or incorrectly specified EndpointIdentity in the EndpointAddress used to create the channel. Please verify the EndpointIdentity specified or implied by the EndpointAddress correctly identifies the remote endpoint.

OperationContext.Current.ServiceSecurityContext