up2date error

[mr xosoftware dk]

Hi, 
When I try to use up2date I get the following
error:

..

 File "/usr/lib/python2.2/httplib.py", line
581, in _send_output
    self.send(msg)
  File "/usr/lib/python2.2/httplib.py", line
560, in send
    self.sock.sendall(str)
  File
"/usr/lib/python2.2/site-packages/rhn/SSL.py",
line 191, in write
    sent = self._connection.send(data)
SSL.Error: [('SSL routines',
'SSL3_GET_SERVER_CERTIFICATE', 'certificate
verify
failed')]
# 
..

It occurs when I get to sending information
to RedHat Network, which results in a
"Problems with user name" error. Can anyone
help me out here. 
Thanx
Martin