iptables: blocking network access for certain UIDs gives error.

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hi. i've never posted/reg here before but have lurked for quite awhile.

i need to block internet access for a couple UIDs. found and a bit of an older thread on this site [url=http://fcp.homelinux.org/modules/newbb/viewtopic.php?topic_id=23058]here[/url]. this is basically what i want to do too but i'm using FC4 and the original post refers to FC3 - not sure if that has anything to do with it. so i'm executing: 

[b] iptables -D OUTPUT -m owner --uid-owner 502 --jump DROP[/b]
but i keep getting: [b]"Bad rule (does a matching rule exist in that chain?)" [/b]

here is the output of [font=Verdana]iptables --list[/font]:

> Chain FORWARD (policy ACCEPT)
> target     prot opt source               destination
> RH-Firewall-1-INPUT  all  --  anywhere             anywhere
> 
> Chain INPUT (policy ACCEPT)
> target     prot opt source               destination
> RH-Firewall-1-INPUT  all  --  anywhere             anywhere
> 
> Chain OUTPUT (policy ACCEPT)
> target     prot opt source               destination
> 
> Chain RH-Firewall-1-INPUT (2 references)
> target     prot opt source               destination
> ACCEPT     all  --  anywhere             anywhere
> ACCEPT     icmp --  anywhere             anywhere            icmp any
> ACCEPT     ipv6-crypt--  anywhere             anywhere
> ACCEPT     ipv6-auth--  anywhere             anywhere
> ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:5353
> ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp
> ACCEPT     all  --  anywhere             anywhere            state
> RELATED,ESTABLISHED
> REJECT     all  --  anywhere             anywhere            reject-with
> icmp-host-prohibited


i checked in [b]ntsysv[/b] and iptables is selected to run at startup. just for the heck of it, i ran [b]iptables--save[/b]. the command does update my [b]/etc/sysconfig/iptables[/b] file stating current date and time for last modified but adds nothing to the file. i have not modified iptables.config in any way. do either/or NetworkManager or NetworkManagerDisbatcher services need to be running for this?

i'm sure lots of people are already doing this. any help would be greatly appreciated!!!



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