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For security reasons I want to turn off SSH when I don't use it and turn it on again via a VNC connection as I can connect to my web server remotely over the Digitalocean control panel's console instead, and turn on SSH that way.

Is below the best way of doing it?

sudo stop ssh
sudo ufw deny 22

And turn on SSH via VNC

sudo ufw allow 22/tcp
sudo start ssh 

Or should I use any of the below variants?

sudo service ssh stop
sudo systemctl stop ssh
sudo /etc/init.d/ssh stop

I'm on a UBUNTU 16.04 LTS server. And I want to disable SSH for all users, not only for root.

closed as off-topic by muru, Mongrel, Jakuje, countermode, Michael Homer Feb 6 '17 at 9:25

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question has been posted on multiple sites. Cross-posting is strongly discouraged; see the help center and community FAQ for more information." – muru, Mongrel, Jakuje, countermode, Michael Homer

  • 2
    I'm not sure I understand your rationale here - AFAIK VNC is much less secure than SSH (unless the VNC is tunneled... over SSH) – steeldriver Feb 6 '17 at 2:17
  • @muru It was only here I got a relevant answer though... by Serge – Gabriel Feb 6 '17 at 14:47
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Ubuntu 16.04 LTS uses systemd, which means you want systemctl.

To prevent the service from starting automatically at boot time, use

sudo systemctl disable ssh.service

To stop currently running one, use

sudo systemctl stop ssh.service

and

sudo systemctl start ssh.service

Note that this stops ssh server. You can still use ssh client to connect to remote hosts, but with ssh server disabled remote connections destined to your machine will be disabled

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