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# Edit the file '''/etc/ssh/sshd_config''' and add a new option of '''"AllowUsers account"''' using your login account for account
# In order for these changes to be effective, issue the following command to restart the sshd service:<br /><b><code><span style="color:#3366CC;font-size:1.2em;">service sshd restart</span></code></b>
# Try sshing from your '''centos1 ''' VM to your '''centos2 ''' VM. Where you successful? Would it work if you let "AllowUsers account" without a username, or a non-existent username?
# Now any hacking attempt also has to guess an account name as well as the password. If you need to ssh with root access, ssh as a regular user and use '''su -''' to become root.
# Next change the default port number that sshd uses (TCP:22).