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Download the repo file and move it to the correct location:
$ wget http://download.opensuse.org/repositories/X11:/RemoteDesktop:/x2go/RHEL_6/X11:RemoteDesktop:x2go.repo $ sudo cp X11:RemoteDesktop:x2go.repo /etc/yum.repos.d/x2go.repo
/etc/yum.conf
.
Standard yum repos do not use the same connection mechanisms as rhn channels.
Congratulations, you are now able to access the X2Go packages. You may continue by installing x2goserver, x2goclient or pyhoca-gui or any other of the available packages.