Following the article http://docs.sitefinity.com/administration-custom-error-pages, I set up custom errors in our web.config to handle 403, 404, and 500 codes, which redirect to custom error pages in Sitefinity. I set up a test page for the 403 and set its permissions to disable viewing by "Everyone". I then logged out of Sitefinity and navigated to the test page. I expected to see the custom error page we set up for the 403, but instead was redirected to the Sitefinity login page. How can I prevent it from redirecting to the login?