SSH connection is exclusively dedicated for the developer’s access to Volumio OS via command-line. It is disabled as default (recommended for security reasons). Enable it only if required, for remote support or for saving a log link.
TO ENABLE SSH:
Navigate to http://volumio.local/dev or http://yourvolumioip/dev, where 'yourvolumioip' is the actual IP address of your device eg. 192.168.1.54.
Find the SSH section, and click 'enable'. From now on your SSH will be permanently enabled. To disable SSH again, click 'disable'.