Description of problem:

Running rhn_register works until i've filled in my *correct* username/password 
combination. If i fill in incorrect credentials i get a nice error message 
telling my that my username/password is incorrect.

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[root@redhat5 /]# rhn_register
An error has occurred:
up2date_client.rhnreg.InvalidDefaultError
See /var/log/up2date for more information
[root@redhat5 /]# cat /var/log/up2date
[Wed Jun 27 17:48:57 2007] rhn_register
Traceback (most recent call last):
  File "/usr/sbin/rhn_register", line 79, in ?
    app.run()
  File "/usr/share/rhn/up2date_client/rhncli.py", line 65, in run
    sys.exit(self.main() or 0)
  File "/usr/sbin/rhn_register", line 64, in main
    ui.main()
  File "/usr/share/rhn/up2date_client/tui.py", line 1834, in main
    tui.run()
  File "/usr/share/rhn/up2date_client/tui.py", line 1745, in run
    result = win.run()
  File "/usr/share/rhn/up2date_client/tui.py", line 469, in run
    self.passwordEntry.value())
  File "/usr/share/rhn/up2date_client/tui.py", line 66, in tui_call_wrapper
    results = func(*params)
  File "/usr/share/rhn/up2date_client/rhnreg.py", line 807, in getPossibleOrgs
    cachedOrgs.setDefaultOrg(orgsFromServer['default_org'])
  File "/usr/share/rhn/up2date_client/rhnreg.py", line 764, in setDefaultOrg
    raise InvalidDefaultError("Tried to set default org to %s. Valid "
up2date_client.rhnreg.InvalidDefaultError: Tried to set default org to 5453675. 
Valid values are []

[root@redhat5 /]#
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When running "rhnreg_ks" though it works, so i managed to register my machine 
via this way. However i find it strange that it doesn't work 
with "rhn_register".