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The Curious Incident of the App_Offline.htm in your ASP.NET 2.0 App
I've gotten more than three issues sent to me recently regarding why an ASP.NET 2.0 app suddenly starts throwing up 404 errors, and each time there is a single culprit: app_offline.htm. I'd point towards some documentation, but honestly I just can't find any out there, so hopefully this will help people figure out what is going on. When ASP.NET 2.0 sees this file, it basically shuts down the process. This is useful if you need to over write a MDB file for example.