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You will need the VNC server password, naturally. You'll need to ask someone who knows what it is!
= Getting the VNC Viewer to Set Up the Tunnel =
Many of the vncviewer programs know how to set up an ssh tunnel automatically. You can use the <code>-via</code> option to enable this from the command line:
vncviewer -via ''username''@142.204.133.122 localhost:0
This instructs vncviewer to set up an ssh tunnel to the account ''username'' on the specified host, and then to connect the VNC server for display 0 on ''localhost'' (from the point of view of the far end of the connection, i.e., 142.204.133.122 in this case).
In order for this to work successfully, ssh must be installed on the same system as vncviewer, and it should be called "ssh" (as exists in OSX and Linux systems, and in mozilla-build on Windows). If you're using putty, copy or rename it to ssh.exe, or use the VNC_VIA_CMD environment variable to specify the ssh command name (see the vncviewer documentation for details).