 <p>Basically if a user gets any error other than 403 or 404 (most notable other than those is 500 which is sent if there's an exception) they'll be redirected to that page, which won't exist (And if you're in IIS7 integrated pipeline or have IIS6 wildcard mapped they'll then get bounced to FileNotFound.htm - otherwise they'll just see a standard 404).</p> <p>It'd probably be nice to at least give the user a "Oh no! Something is wrong!" page.</p>