Fixed the issue: The HTTP request is unauthorized with client authentication scheme 'Anonymous'. The authentication header received from the server was 'NTLM'

Today, I wrote a unit test to consume one web service method and I got the following error.

The HTTP request is unauthorized with client authentication scheme 'Anonymous'. The authentication header received from the server was 'NTLM'.

After looking into this issue, in app.config , it uses security mode =None and clientCredentialType =None.

<security mode="None">

<transport clientCredentialType="None" proxyCredentialType="None" realm="" />

<message clientCredentialType="UserName" algorithmSuite="Default" />

</security>

After using the following code, everything is working perfectly.

<security mode="TransportCredentialOnly">

<transport clientCredentialType="Ntlm" proxyCredentialType="None" realm="" />

<message clientCredentialType="UserName" algorithmSuite="Default" />

</security>