How to put up Maintenance Page for ASP.NET Web Application in IIS

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Put in a static file named app_offline.htm in the root of the site. Afterwhich, all requests for that site will be served from this file.

Technically, what happens is that the entire application domain will be stopped and unloaded, all without performing an IIS reset.

Note the following caveats:

  1. Any error in the Web.Config may result in the app_offline.htm page not showing up!
  2. The file (app_offline.htm) must be of at least 512 bytes for it to take effect for IE browser. Otherwise, IE would display a “Friendly Error" message by default.
  3. The effect of this file is that the server will serve out a HTTP response bearing this header: HTTP/1.1 503 Service Unavailable

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