It is probably a good idea to configure the server to use
up2date and Current to update itself as a client, as well.
To do this, simply perform all the configuration steps on the server that you
would on a normal client; the client and server software bits are totally
disjoint and communicate only through XMLRPC calls, they do not step on
each other on the same system.
As of versions 1.5.x, the cadmin command family uses the
XML-RPC library supplied by Red Hat's up2date package in order to communicate
with the server rather than working totally independently. This requires the
up2date configuration file in /etc/sysconfig/rhn/up2date
to be pointed at the actual Current server. This implies two fairly
important changes to managing your server; first, you can now (if you so choose)
run cadmin from a machine other than the actual Current
server, assuming you copy the necessary executable over to the new machine,
and second, the machine that is running the cadmin command
must have it's up2date configuration file pointed at the Current server (as
above), and not at RHN.