I'm running Drupal 6 on IIS 7. I'm trying to get custom error pages working so that when users aren't logged in and they try to access restricted content they're redirected to the login page. For this I'm intending to use the logintoboggan or custom_error modules. However, regardless of how I set my default error pages in admin/settings/error-reporting I still see the standard 403 page. Is this because I need to do something in IIS web.config to tell IIS to observe those error page settings in admin/settings/error-reporting?