why is iptables still filtering after i disable the firewall?

[Christopher Chan]

Robert P. J. Day wrote:
>   i suspect this is based on my unfamiliarity with the way ubuntu
> pre-10.10 deals with firewalls but i'm trying to simply ping from my
> ubuntu system to a centos 5.5 box on the same in-house wireless
> network and i'm getting icmp responses, "Destination Host
> Unreachable."  yet i can ping the other way (centos -> ubuntu).

I would completely uninstall 'uncomplicated firewall' and restart the 
network. Ubuntu's complicated approach to trying to make it simple for 
users to setup firewall rules is just broken.