Reload SSH unknown instance

If you get the unknown instance message while reloading SSH :

That means that SSH is not running, you have to start it.

sudo /etc/init.d/ssh start

Or

sudo start ssh

Or

sudo stop ssh
sudo start ssh

Check if it is working :

ps -ef | grep sshd

Output :

root      1234     1  0 12:28 ?        00:00:00 /usr/sbin/sshd -D