title: app_offline site returning "The service is unavailable."
body: <p>I am following Scott gu's trick of placing a App_Offline.htm page at the route of my application to bring it offline - <a href="http://weblogs.asp.net/scottgu/archive/2006/04/09/442332.aspx" rel="noreferrer">http://weblogs.asp.net/scottgu/archive/2006/04/09/442332.aspx</a></p>
  
  <p>It does not seem to be working on one of my sites though. I place the file in IIS7 of one my sites, and all traffic is redirected to it.</p>
  
  <p>However in the other site, same server etc, I get a page that contains "The service is unavailable.".</p>
  
  <p>Not sure where I am going wrong - any ideas?</p>