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# 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 <code>/etc/ssh/sshd_config</code> and look for the option <code>PermitRootLogin</code>. Uncomment the option (or add the option if it does not appear) and change it the option value to <code>"no"</code>.
# Even better it is possible to restrict access to just specific users that require it.
# Edit the file <code>/etc/ssh/sshd_config</code> and add a new option of <code>"AllowUsers account"</code> using your login account for account.