I am new to Linux Dedicated server hosting and plesk panel 11 and i would like to know about inbuilt plesk 11 firewall security features and how harden it is?
closed as primarily opinion-based by Ward, mdpc, Falcon Momot, Lucas Kauffman, Tom O'Connor♦ Aug 26 '13 at 23:56
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It is strong enough and is powered by iptables although it is not very flexible. But having some knowledge of iptables you can do pretty much whatever you want.
By the way there is a board specialized in firewall and security.
To be a bit pedantic, it's no stronger than your configuration and the underlying application and kernel.
Plesk is not, in and of itself, a firewall any more than it's an operating system. It's a web front-end for the base OS's tools and applications.
NetFilter/IPTables is an excellent network filtering tool. You should also spend some working with the command line and figure out how Linux works.