title: VSTS Authenticating with vssClientCredentials
body: <p>I am currently trying to connect to a VSTS project using the code below, I have previously connected successfully after entering credentials into the dialog box shown.</p>
  
  <pre><code>if (!IsConnected)
  {
      sourceControl = release.SourceControl;
      connection = new VssConnection(new Uri(sourceControl), new VssClientCredentials());
      workItemTrackingHttpClient = connection.GetClient&lt;WorkItemTrackingHttpClient&gt;();
  }
  </code></pre>
  
  <p>The dialog box is no longer shown and an exception is thrown:</p>
  
  <blockquote>
    <p>TF400813: Resource not available for anonymous access. Client
    authentication required.</p>
  </blockquote>
  
  <p>I am unaware of any changes that could have caused this to break, any help would be greatly appreciated.</p>