Why would an aspx file return 404 (“The page cannot be found”)

Question

Why when I access an aspx (e.g., http://www.example.com/foo.aspx - not the real site) through IE6 would I get a 404 Error (i.e., \"The page cannot be found\") in IIS6

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Answer 1

I had this issue where some customers were reporting the 404.0 and some didn't have the problem at all(same page). I was able to navigate to any of the pages with no problems from my machine. Some customers would refresh and it would go away. I am using .Net 4.5.2 and IIS 7.5.

Looking at the IIS log file I would see:

sc-status sc-substatus sc-win32-status
404 0 2

sc-status.sc-substatus: 404.0 - Not Found
sc-win32-status: 2 - ERROR_FILE_NOT_FOUND
https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx https://en.wikipedia.org/wiki/HTTP_404

I found the problem was I had deployed a new version of the website in which the old version of the website had RouteConfig.cs/FriendlyUrlSetting setup by creating a project using the web forms template. The new version was created using an empty template. So obvious to me now.. no URL routing. Customers had a cache issue with certain pages on their machine(no .aspx extension) and having them clear browser data ultimately fixed the problem.