IIS serving blank ASP content
I'm not sure if I was missing something in my Windows Server 2012 IIS 8.5 configuration; or it was related to deploying the web-sites via BizTalk Server 2013 R2 MSI package: but my no content was being served for my web-apps.
Just an unimaginative blank page. I checked Asp.NET was installed and registered, and checked the HTTP status codes and log files. All looked fine, with HTTP 200 being returned to page requests.
I discovered that if I copied the content of my apps to another directory they would load fine. More investigation showed that static content would not be rendered either. Deleting the directory and creating a new one with the same name, even the most basic text file as content would produce a blank page.
As it seemed to be related to the directory name I trawled the config files and found a way to fix it is to strip out the configuration for locations in IIS, which seems to persist despite deleting the related directory. To do this, with elevated privileges, edit %systemroot%/system32/inetsrv/config/applicationHost.config. There will be