I only have info for APF which gives a lot of module loading errors and which blocks wget and doesn't allow users to use ftp correctly when given a range of ports to use.
I can probably give you a fix for the ftp issue if you can tell me what you already know. It would be the same method I used to allow ftp with ipchains, but updated for iptables.
And if anyone can point me to a 1-to-1 translation rule for converting ipchains rules to iptables rules, I can create a working firewall rather quickly, as I have a complete working firewall for ipchains that works well with DA.
Thanks for your info to help. Unfortunately, I'm not using a VPS anymore, so I can't provide more details.
It seems APF or Kiss still cannot be run inside a VPS and the admins of such setup usually build a firewall with custom rules instead of using those automatic tools.