By default, the homepage of a hostmaster site is not present (or not reachable to anonymous users), so the site displays a 403 error because one is not logged in.
This makes monitoring tools complain when checking for HTTP on the server.
It's also very weird for users to get to a site and have an "Access denied" message thrown into their faces. It would be better to have some kind of basic page that says welcome and maybe explains what the site is used for.
So, how about having hostmaster start up with a default homepage?