If you follow the instructions on how to install the Rails Redmine PM Software (available here) and are using Apache with Passenger (REE), you need to delete the .htaccess file that is kept in RAILS_ROOT/public directory. Otherwise you'll see a 404 page not found error. Took me a while to hunt this down. I stopped thinking about .htaccess in Rails apps but I guess REE+Passenger isn't the default deployment yet.