Tried setting some custom rules in the Plesk firewall module, getting:

"cannot activate firewall configuration
iptables v1.2.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)"

Whazzup with that?

 

Perhaps this article in the knowledge base may help.

http://kb.swsoft.com/article_117_746_en.html

Hartmut