How to fix single sign-on when it stops working

Posted on July 7, 2014 Updated on July 8, 2014

Sometimes this happens.  All of a sudden single sign-on no longer works on your web application.  In my case I was able to fix this by moving NTLM authentication to the top of the list in IIS.

Here are the procedures:

1.  Open IIS and select your default website

2.  Click ‘Authentication’ and right-click on ‘Windows Authentication’

3.  Select ‘Providers’ and move NTLM to the top