A question containing COM1 as title will trigger this error


Server Error in '/' Application. The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested URL: /questions/1677444/COM1

  • that of course works for all the other device names as well... Nov 4, 2009 at 23:47
  • You should refrain from making short-non explicative titles. This looks like a feature to me :)
    – perbert
    Nov 5, 2009 at 0:12
  • agreed, but still a "hole" Nov 5, 2009 at 1:34
  • @Stefano Borini: I know, there was a problem some time ago with web.config tags too (don't know if it was fixed and I'm way too lazy to look it up, but not lazy enough to stop typing in the comment box provided by our benefactor or overlord, wich one you prefer. I'm sorry I wasted your time when you could be anywhere else doing something productive. Go now. Put that giant S down. Please don't hurt me. Stop hitting me. Please! Waaah! ... pluralization errors censored)
    – perbert
    Nov 5, 2009 at 2:18

2 Answers 2


This is a known issue of ASP.NET MVC routing, not StackOverflow.

ASP.NET MVC Routing vs. Reserved Filenames in Windows


This has been fixed since our upgrade to .Net 4 (though you can't create a title that short anymore anyway...). A post by Phil shows the change.


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