First, try REALLY HARD to get access to the server logs (either somewhere under /usr/local/apache or in /var logs. They're typically world-readable (if you have an account on the server, anyway!) and will tell you what's going on. They might be called anything, but you'll usually see 'http' and 'error' in the filename.

Second, I would try seeing if the redirects work without making a transition to the https: server. In other words, see if you can get yourself to a pure HTML page. Do the https: pages come up if you manually type the URL in?