Comment by Daviey

It almost looks like someone is trying to work out how to bring up a static page..

  <!-- Web.Config Configuration File -->

  <configuration>
      <system.web>
          <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
      </system.web>
  </configuration>

To be fair to them... What would Stackoverflow admins do if their site went down? TechNet is the ISS equivalent.