1. Go to "https://rhn.redhat.com" with a Mozilla-based browser (default configuration) 2. See the warning "You have requested an encrypted page that contains some unencrypted information. Information that you see or enter on this page could easily be read by a third party." for every page being loaded. Mozilla might need a change in configuration to show this: Preferences -> Privacy & Security -> SSL -> tick "Viewing a page with an encrypted/unencrypted mix"
This was fixed in RHN 4.0.6.