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Let’s assume that you are on computer A and you wan to connect to a remote linux machine B using VNC. You need to follow these steps in order to achieve just that:
1. Install x11vnc and openssh-server on B. The corresponding daemons should start automatically, but if not, then
$ /sbin/service sshd start
$ vncserver :0 -localhost
.

2. Make sure that on B the firewall (if installed and active) allows connection to port 22 from anywhere (for ssh connection) and to 5900 from localhost (i.e., 127.0.0.1). These are the commands (in case of ufw as the firewall) to allow traffic to the specific ports.
$ sudo ufw allow 22
$sudo ufw allow from 127.0.0.1 to any port 5900

3. If B is behind a router firewall, you need to forward port 22 to the router. (You should do this in the router configuration page).
4. On A, create a newfile, vnc2b.sh and enter the following


#!/bin/sh
ssh -f -L 5900:localhost:5900 username@remote_hostname \
x11vnc -safer -localhost -nopw -once -display :0 \
&& sleep 5 \
&& vncviewer localhost:0

and make the file executable:
$ chmode u+x vnc2b.sh.

Next time when you want to vnc to B, just type:
$ ./vnc2b.sh

Reference: here.

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