title: "There was an error while performing this operation"
body: <p>I have a website in IIS for which I cannot open any of the settings like Authentication, Handler Mappings, Authorization Rules etc. It just shows the error message "There was an error while performing this operation", with no more details and points to web.config.</p>
  
  <p>Browsing the website results in a 500.19 error.</p>
  
  <p>I tried adding <code>iis_iusrs</code> to the website folder and web.config, changing the app pool identity giving access to same on web.config/website folder security settings, verified target framework, iisreset/app pool recycles to no avail.</p>