Forward x11 via ssh

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Since the 5901 port is forbiddended via administrator of the switch, we have to forward the traffic to remote machine via ssh:

First in our machine type following command:

ssh -L 2333:A:5901 A -l Trusty

This will forward the A machines’ 5901 to local’s 2333 port.
Then use a vncviewer software for accessing local machine’s 2333 port:

vncviewer localhost:2333

Notice, the virtualbox’s is named to vboxgtk in opensuse.