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  • Phuong 6 posts 36 karma points
    Sep 12, 2018 @ 03:32

    Custom not found 404

    I have already add the custom error to handle case 404 in the web.config.

    <httpErrors errorMode="Custom">
      <remove statusCode="404" subStatusCode="-1" />
      <error statusCode="404" prefixLanguageFilePath="" path="/support/404" responseMode="ExecuteURL" />
      <remove statusCode="500" subStatusCode="-1" />
      <error statusCode="500" prefixLanguageFilePath="" path="/support/500" responseMode="ExecuteURL" />

    Then it works well with some resource not exist in our system. But when I try with mydomain/imagegen.ashx?image=notexistimage, it's still display the default page not found, that's not my custom not found page.

    enter image description here

    Could someone help me resolve it?

  • Douglas Robar 3570 posts 4711 karma points MVP ∞ admin c-trib
    Sep 12, 2018 @ 11:55
    Douglas Robar

    Catching errors is, unfortunately, more complex than might be supposed. Here's a great blog post that should help. along with some docs at


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