title: AD FS endpoints unavailable
body: <p>AD FS endpoints unavailable.
  I configured AD FS. But when I try to connect to some endpoints, I can see "HTTP Error 503. The service is unavailable."  The endpoints are enabled in the AD FS management. </p>
  
  <p>I try to connect to<br>
  ......adfs/services/trust/13/usernamemixed<br>
  and<br>
  ...../services/trust/13/windowsmixed</p>
  
  <p><a href="https://i.stack.imgur.com/fwm4y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fwm4y.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/NXoAH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NXoAH.png" alt="enter image description here"></a></p>