How to fix single sign-on when it stops working

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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

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