I'm using SS 2.4.7. I'm following the Schommer 'Complete guide to...' book and so far almost everything has worked. As specified in the book, I'm using my own theme called mysite.
Chapter 5 tells me I can force a login by going to www.mysite.com/Security/login (obviously I replace mysite with my own domain). That just gives me a 404 message:
The requested URL /Security/login was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.