Taken from #864352:

Description of problem:
(In reply to bug #864352 comment #10)
> Test version:
> rhev-hypervisor6-6.4-20130116.3.0.el6
> ovirt-node-2.5.0-15.el6.noarch
> 
> Steps:
> 1.Install RHEV-H and register to RHN
> 2.Run guest on top of RHEV-H host (prefer RHEL guest and configure network)
> 3.check RHN virtual systems section.
> 4.Then deleted the rhevh on RHN web side, and register rhevh to RHN again.
> 5.check RHN virtual systems section.
> 
> Result:
> After step 3, check that the guest is listed under "Hosted Virtual Systems "
> in rhn virtualization tab
> But After step 5, Still check that info "No virtual systems." was shown on
> RHN Web side.
> 
> Also After register rhev-h to rhn, run rhn-profile-sync:
> [root@localhost admin]# rhn-profile-sync
> Updating package profile...
> Updating hardware profile...
> Updating virtualization profile...
> An error has occurred:
> <type 'exceptions.TypeError'>
> See /var/log/up2date for more information
> 
> [root@localhost admin]# cat /var/log/up2date 
> [Tue Jan 22 05:47:43 2013] up2date updateLoginInfo() login info
> [Tue Jan 22 05:47:43 2013] up2date logging into up2date server
> [Tue Jan 22 05:47:44 2013] up2date successfully retrieved authentication
> token from up2date server
> [Tue Jan 22 05:47:44 2013] up2date Updating package profile
> [Tue Jan 22 05:47:51 2013] up2date 
> Traceback (most recent call last):
>   File "/usr/sbin/rhn-profile-sync", line 56, in <module>
>     cli.run()
>   File "/usr/share/rhn/up2date_client/rhncli.py", line 84, in run
>   File "/usr/sbin/rhn-profile-sync", line 51, in main
>     support.refresh(True)
>   File "/usr/share/rhn/virtualization/support.py", line 82, in refresh
> <type 'exceptions.TypeError'>: poll_through_vdsm() takes exactly 1 argument
> (0 given)