title: Using an alternative authentication backend for Django admin
body: <p>I'm using CAS for authentication on my Django site (via django-cas-ng). If I log in through CAS and then visit the admin site, it works fine, but if I visit the admin site when not logged in, it redirects to the admin site's login form instead of to the CAS login page. How can I make it redirect to the CAS login page instead?</p>