title: 503 Service unavailable is not handle by any IIS error pages or ASP.net Error page
body: <p>I'm trying to go custom error when my error code is 503 but its not redirecting . for other code its working fine . But when I stop application pool I m getting 503 service unavailable error page. I want to redirect my customize error page. I tried with both ASP.NET error page as well as IIS Error page. its working for all other error code.</p>
  
  <pre><code> &lt;httpErrors errorMode="Custom" existingResponse="Replace"&gt;
    &lt;remove statusCode="404" subStatusCode="-1" /&gt;
    &lt;remove statusCode="503" subStatusCode="-1" /&gt;
    &lt;error statusCode="503" prefixLanguageFilePath="" path="http://www.google.com" responseMode="Redirect" /&gt;
    &lt;error statusCode="404" prefixLanguageFilePath="" path="http://www.google.com" responseMode="Redirect" /&gt;
  &lt;/httpErrors&gt;
  </code></pre>