unable to load iptables module (ip_tables), aborting

If you are getting the above mentioned error while installing apf on your server then your kernel is compiled with iptables statically instead of as a module, and you will need to change this in the conf.apf

MONOKERN=”0″ Set it to “1″

So open your conf.apf file in writable mode and modify it then restart the apf service and you wont see that error.