1. Open IIS Manager
2. Click the server name in the tree on the left
3. Go to the right hand pane>>Management section and double click Configuration Editor
4 At the top, chose the section
system.webServer/security/authentication/windowsAuthentication 5. Right hand pane, click
Unlock Section
6. At the top, choose the section
system.webServer/security/authentication/windowsAuthentication 7. Right hand pane, click
Unlock Section
8. Open a elevated CMD or command prompt. Enter the command: iisreset and press the Enter key