If you lost your password, you will be able to retrieve your access to the RHN following these steps:
-go to http://rhn.redhat.com
-click on "lost login/password"
-if you lost your login, enter your email address in the "Red Hat login unknown" section and click on "send login" button;
-if you have lost your password, enter your login and the corresponding email address, then click on the "send password" button.
An email will be sent to you with the related information.
In case you should not have this email address, please contact Customer Service