Simple: after everything is working, go to /etc/fail2ban
Here, open jail.conf in your favorite editor. Find the entry:
enabled = false
filter = sshd
action = iptables[name=SSH, port=ssh, protocol=tcp]
sendmail-whois[name=SSH, email@example.com, firstname.lastname@example.org]
logpath = /var/log/sshd.log
maxretry = 5
and change enable = false to enable = true for SSH. Do the same for the other services you wish to protect, as well. Also add the entry I posted in the previous message, for pure-ftpd.
After saving the file, give the command service fail2ban restart
then check the logs in IPConfig.