title: Basic Authentication: IE 11 Does Not Prompt for Credentials - Chrome and FF Do
body: <p>I have created an MVC application and deployed it to IIS 8.5 on an Azure VM.  I specify authentication mode=Windows in Web.Config and Basic Authentication on IIS. So far, everything works as advertised.  </p>
  
  <p>Then when I navigate to the application in Chrome and Firefox, I'm prompted for username/password, enter the credentials, and this also succeeds.  </p>
  
  <p>But when I navigate to the application in IIS, I get no prompt for credentials and a 401.2 response with this message: <strong>HTTP Error 401.2 - Unauthorized. You are not authorized to view this page due to invalid authentication headers.</strong></p>
  
  <p>I've compared the requests and responses in Fiddler.  They're substantially the same through the 401.2, but Chrome and FF then prompt for Credentials while IE just displays the error.</p>
  
  <p>When I change Basic Authentication to Anonymous on IIS, the navigation is successful.  I've tried temporarily giving the application pool full control, but without success.</p>
  
  <p>Both the WindowsAuthentication and WindowsAuthenticationModule are loaded, and I've set the Default Domain and Realm in IIS.</p>
  
  <p>Any thoughts?</p>