Troy,

When updating with yum I see that the rhnplugin is enable by default and
yum mentions "The system is not registered with RHN. RHN support will be
disabled".

The next rhn packages are also present after the installation:
rhn-check.noarch   1.0.0-38.el6     
rhn-client-tools.noarch
rhn-setup.noarch   1.0.0-38.el6     
rhn-setup-gnome.noarch
rhnlib.noarch      2.5.22-9.el6     
rhnsd.i686         4.9.3-2.el6      
yum-rhn-plugin.noarch

Do the rhn packages be removed?

Regards,
Michel