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I have 3 machines..

  • A. My local machine at home (MacOSX).
  • B. Machine at work that I can SSH into (middle man). It is a small virtual machine running Ubuntu server and I can open new ports
  • C. Another machine at work running Ubuntu Desktop with vine for remote desktop access I can access this machine with SSH via B.

So I can SSH from A -> B and from B I can see open ports in C. I want to access C using a VNC client.

Is there a way to setup a tunnel from A to C through B?

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Based on answer https://superuser.com/a/371082/281372, here's what you need to do specifically:

user@machineA $ ssh -fN -L59595:machineC:59595 user@machineB \
                -c 'ssh -fN -L59595:machineB:5900 user@machineC' &

user@machineA $ vncviewer localhost:59595

This opens a ssh session from A to B with a tunnel from A:59595 to B:59595; and in the ssh session on B, it opens a new ssh session from B to C with a tunnel from B:59595 to C:5900.

Then back on A, you vnc to localhost:59595. It is tunneled to B:59595, which then catches it and retunnels it to C:5900.

I have not tested it.

(In a previous answer I recommended socat and netcat, but it's clear now you want the whole tunnel protected by ssh.)

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  • Thx, I hava tested your vnc and ssh answers, but seems like VNC uses a slightly more complex protocol since I reach the computer, send the password but the connection doe s not progress anymore
    – jab
    Apr 21, 2020 at 13:55

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