[CentOS] CentOS Network Exception

Hi,

The following exception occurred.

The system was upgraded from RedHat 9 Legacy (updated regularly using
Fedora Legacy project) to CentOS 4.1 (Linux 2.6.9-11).

When I installed yum and yum-conf, I had a problem of yum not getting
$releasever.  Thus I hand edited /etc/yum.repos.d/CentOS-Base.repo 
$releasever
to 4.   I did the full update using yum.  Now up2date gets the following 
exception.
I don't understand why it is looking for CNS-CA-CERT.

Exception type exceptions.ValueError

Exception Handler Information
Traceback (most recent call last):
  File "/usr/share/rhn/rhn_applet/rhn_applet.py", line 586, in refresh
    self.model.refresh(force)
  File "/usr/share/rhn/rhn_applet/rhn_applet_model.py", line 447, in refresh
    source.refresh(force)
  File "/usr/share/rhn/rhn_applet/rhn_applet_source.py", line 35, in refresh
    self._do_refresh()
  File "/usr/share/rhn/rhn_applet/rhn_applet_rpc.py", line 190, in 
_do_refresh
    server = self.create_server()
  File "/usr/share/rhn/rhn_applet/rhn_applet_rpc.py", line 83, in 
create_server
    s.add_trusted_cert(self.__cert__)
  File "/usr/lib/python2.3/site-packages/rhn/rpclib.py", line 440, in 
add_trusted_cert
    self._transport.add_trusted_cert(certfile)
  File "/usr/lib/python2.3/site-packages/rhn/transports.py", line 253, 
in add_trusted_cert
    raise ValueError, "Certificate file %s is not accessible" % certfile
ValueError: Certificate file /usr/share/rhn/CNS-CA-CERT is not accessible