If you try to run yum update or yum install on a new RHEL 5 server, you will get an error like the one below.
# yum update
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Update Process
No Packages marked for Update
To register the server with RHN you need to run rhn_register and login with your RHN account.
