title: Windows Authentication Credential box asking multiple times in IE8 and IIS7
body: <p>We have couples of intranet websites hosted on the Windows 2008 Server and all of them are using the Windows Authentication mode.  For Example,</p>
  
  <ol>
  <li>SiteA</li>
  <li>SiteB</li>
  <li>SiteC</li>
  <li>SiteD (Not working)</li>
  <li>SiteE (Not working)</li>
  </ol>
  
  <p>Among them, without any special modification, SiteA, B and C are working while Site D and E are not working in IE8.  I double checked the settings and I am sure that I set all the same setting.  But when I use Firefox to test, all sites are working.</p>
  
  <p>In IE8, for SiteA, B and C, I don't even need to type my credential and it logs in automatically by using my AD account.  But for Site D and E, it asks the username and password for 3 times and after that, I got the following error message even though I provided the correct one.</p>
  
  <pre><code>401 - Unauthorized: Access is denied due to invalid credentials.
  You do not have permission to view this directory or page using the credentials that you supplied.
  </code></pre>
  
  <p>I attached my Authentication and Authroization setting for those sites which have errors.
  <img src="https://i.stack.imgur.com/dgEjd.jpg" alt="enter image description here"></p>
  
  <p>The advanced settings is as follow:</p>
  
  <p><img src="https://i.stack.imgur.com/xJOYn.jpg" alt="enter image description here">
  <img src="https://i.stack.imgur.com/SbJxm.jpg" alt="enter image description here"></p>
  
  <p>How can I configure these erroneous sites to work like SiteA, B and C?  What did I miss?</p>
  
  <p>We don't have Security Tab in IE8 coz of the company policy and we don't tweak anything for SiteA, B and C to work correctly.</p>
  
  <p>Thanks everyone.</p>