title: IIS 8.5 fails serving ASP.Net MVC pages after app pool recycle
body: <p>We have hit a strange issue which I cannot find any reference to while searching the web.</p>
  
  <p>We have a small number of ASP.Net MVC based apps on a web server which fail after their app pools have recycled. </p>
  
  <p>The default/home returns a blank page, and if you try to go to other pages you get a 404. IIS still serves static content such as css or js if you specifically go to them. </p>
  
  <p>Nothing is recorded in the Win or IIS logs as errors or warnings, nothing stands out.</p>
  
  <p>We can resolve the issue by either redeploying the app or deleting the sites compiled files in the Temp ASP.Net folder, forcing a recompile. But obviously once app pool recycles again it breaks. </p>
  
  <p>The only thing that's changed on the box is a installing .Net Framework 4.7.2 along with a few Win Updates.</p>
  
  <p>However dev versions of the same app or on another box which work fine and that's also been updated to 4.7.2 etc.</p>
  
  <p>How can I solve this?</p>