# Think of a good quality password and change your root passwords on all 3 VM's to be more secure. (It would be a good idea to do this for non-root accounts also)

# The next change you can make is to prevent the root account from logging in to sshd altogether.

# Edit the file '''/etc/ssh/sshd_config''' and look for the option '''PermitRootLogin'''. Un-comment the option (or add the option if it does not appear) and change the option value to '''"no"'''.

# Even better, it is possible to restrict access to just specific users that require it.