title: WebDav Error on saving file: "UPLOAD FAILED: You are required to sign in to upload your changes to this location"
body: <p>I have enabled WebDAV on IIS version 6.2 on my server. I want to modify MS Word documents on the server from client machines using WebDAV. MS Office 2016 is installed on client machines and the server. 
  so for this purpose, I created a mapped connection to my destination folder on the server:</p>
  
  <p><a href="https://i.stack.imgur.com/AyFgY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AyFgY.png" alt="enter image description here"></a></p>
  
  <p>Then it asked my credential:</p>
  
  <p><a href="https://i.stack.imgur.com/g12sO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/g12sO.png" alt="enter image description here"></a></p>
  
  <p>After entering my login info I could successfully see the contents of my folder.</p>
  
  <p><a href="https://i.stack.imgur.com/QuFX9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QuFX9.png" alt="enter image description here"></a></p>
  
  <p>But when I want to save my changes on file it throws an error: 
  "UPLOAD FAILED: You are required to sign in to upload your changes to this location."</p>
  
  <p><a href="https://i.stack.imgur.com/0SYo8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0SYo8.png" alt="enter image description here"></a></p>
  
  <p>Does anyone know any solution for this? Am I supposed to sign in somewhere?</p>