title: ADFS 2.0, how to clear the credential cache?
body: <p>I hit this signout issue for a long time and couldn't find a solution. At the beginning it was my website using ADFS 2.0 couldn't signout even if the correct signout url has been opened. I thought that was some cookies not cleared. After that, I found that it was probably the problem of ADFS server.</p>
  
  <p>I have tried:</p>
  
  <ol>
  <li>Stop iis server, so I don't have my website at all, just testing adfs.</li>
  <li>Clear my browser cookies. Close and reopen. So it is clean.</li>
  <li>Directly logon to adfs, e.g.: <a href="https://mydomain/adfs/ls/?wtrealm=mysite&amp;wa=wsignin1.0" rel="nofollow">https://mydomain/adfs/ls/?wtrealm=mysite&amp;wa=wsignin1.0</a> , here i get the popup window for username and password.</li>
  <li>Directly logout by accessing: <a href="https://mydomain/adfs/ls/?wtrealm=mysite&amp;wa=wsignout1.0" rel="nofollow">https://mydomain/adfs/ls/?wtrealm=mysite&amp;wa=wsignout1.0</a></li>
  <li>Clear my browser cookies.</li>
  <li>Try to logon using url from 3 again. I get logged in and don't see any pop up. In browser developer tool. I see the redirect to my website.</li>
  </ol>
  
  <p>I used Fiddler to capture the traffic, it seems the authentication is using NTLM. Looks like the browser obtained the credentials from somewhere (not in cookies as confirmed). The only way to get the popup back is closing the browser process, and reopen the logon url. Does anyone know how to get it really signout?</p>