I am using IIS on a Windows Server virtual machine where my applications are deployed. Windows Server received the updates and it restarted after the updates finished. After the restart, When I accessed my site, a pop up appeared asking for a sign in. Pop up looked like below.
I checked SSL but it was not an issue. I checked authentication and the access to site and it was also not an issue. It is a common issue. Because when I browse Default Web Site on IIS, either http or https, it is not giving me the IIS(Internet Information Services) page that it does when it is working correctly.
I tried the above expecting that it would resolve the issue and pop up will disappear but none of it worked.