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How to create an SSH tunnel for vncviewer

What I'm doing is using a vncviewer to connect to a vncserver, via an intermediary host (such as a firewall), using a SSH Tunnel between HostA and HostC, to encrypt communications.

I have the same unprivileged userid on all three hosts. Also, I used ssh keys for authentication, just to speed things up. Otherwise, you can specify username@host and enter the password when asked.

$ ssh -N -T -X -f HostB.example.com -L 5905:HostC.example.com:5905 --sleep +30m
$ vncviewer localhost:5905 &

Change the “+30m” to however long you want the ssh tunnel to stay open. You can also use “+8h” or “+1d”.

+----------+        +----------------+        +-------------+
| Host A   |        |                |        |   Host C    |
|          |------->|  Host B        |------->| destination |
| vncviewer|        | "intermediary" |        | vncserver   |
+----------+        +----------------+        +-------------+