Possible Duplicate: How strong is parallels plesk 11 inbuilt firewall for linux os? I am new to Linux Dedicated server hosting and plesk panel 11 , i am looking for inbuilt firewall module . Is it comes with free in plesk 11 or i need to pay or plesk 11 doesn't support firewall?. I looked at the demo http://www.parallels.com/products/plesk/demos/, but i couldn't find any information about firewall in plesk 11.