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

Hint: If you are behind a proxy, make sure the proxy is defined in /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.

Check that you have activated the “optional” channel:

sudo rhn-channel -l

If the optional channel for your base channel is not active, activate it. e.g.:

sudo rhn-channel --add -c rhel-x86_64-server-optional-6

Currently, even in the optional channel, there is no official package for sshfs and it is not (yet?) included in the x2go repo. Thus it has to be downloaded form an alternate source:

sudo yum install fuse fuse-libs
wget http://pkgs.repoforge.org/fuse-sshfs/fuse-sshfs-2.2-1.el6.rf.x86_64.rpm
sudo rpm -i --nosignature fuse-sshfs-2.2-1.el6.rf.x86_64.rpm

URL to most recent EPEL repo installation package available here

wget http://mirror01.th.ifl.net/epel/6/i386/epel-release-6-7.noarch.rpm
sudo rpm -i epel-release-6-7.noarch.rpm
sudo yum install fuse-sshfs

You should now be able to install the x2goserver package:

sudo yum install x2goserver

Warning: Note that currently the server must be in runlevel 5 to accept connections.