title: Enable Windows Auth and disable Forms auth on Admin folder
body: <p>Just moved a site from Windows Server 2003 to Windows Server 2012 and having difficulty restricting access to the Admin directory.  In the older version of IIS, all I needed to do was disable anon access to that folder.  In IIS8, I have:</p>
  
  <ul>
  <li>Anonymous Authentication:  Disabled</li>
  <li>ASP.NET Impersonation:  Disabled</li>
  <li>Basic Authentication:  Disabled</li>
  <li>Forms Authentication:  Enabled</li>
  <li>Windows Authentication:  Enabled</li>
  </ul>
  
  <p>This gives me an Alert that says:</p>
  
  <blockquote>
    <p>Challenge-based and login redirect-based authentication cannot be used simultaneously.</p>
  </blockquote>
  
  <p>Which I find completely reasonable.  However, I am trying to disable "Forms Authentication" and the next Alert says:</p>
  
  <blockquote>
    <p>This feature has been locked and is read-only</p>
  </blockquote>
  
  <p>How can I force an ASP.NET site's admin directory (only that directory) to require Windows Authentication?</p>