Sporadic error: The file has not been pre-compiled, and cannot be requested

Question

Symptoms: ASP.NET Web Forms website on Azure sporadically crashes and all .aspx page requests fail with this error. The problem seems random and only happens once in a great

Answer 1

I get the same problem from time to time, on aleatory pages that where working and suddenly stop. Like this

But i know for a fact that the page is pre-complied The "WORKAROUND" for me is very strange.

1. Go into the Temporary ASP.NET Files folder in the offending server,
2. Search for 0kb .deleted files
3. Delete them.

Eric Sassaman explains, in his answer, why this happens. Will try to upgrade to 4.8 and see if it solves the issue.

*I've been having this issue, and applying my workaround, since 4.2, i think. I find it strange that microsoft states that is was introduced with 4.7. Today i gave another shot at finding the root cause of the problem and found this thread.

Thank you Eric for your efforts, for contacting Microsoft and posting their response.