I'm working in MVC 5 application, and all was working well. but after time of edits and updates, I get a blank page when I try to run or debug it in my local machine.
the blank page come if I working under local IIS or IIS Express or VS development server, all return a blank page.
The response header of the request is 503 Service Unavailable
I find the app_offline.htm file in the directory of my application which cause this behavior...
Just write for who may get this later, I don't know how/when this file come there.