[CentOS] running 2.6.19 on centos 4.4

[Maciej Ĺťenczykowski]

> Applying iptables firewall rules: iptables-restore v1.2.11: iptables-restore: 
> unable to initializetable 'filter'
> Error occurred at line: 3
> Try `iptables-restore -h' or 'iptables-restore --help' for more information.
>                                                           [FAILED]
>
> Have I not included something in the kernel?

Certainly looks like you have not included the entire netfilter 
firewall/networking stack, just find it in the kernel config menus and set 
all of netfilter/iptables to modules (there's tons of them).

Maciej