[CentOS] Screwed up my iptables firewall

Wed Jan 25 16:38:13 UTC 2006
Barry L. Kline <blkline at attglobal.net>

James Pifer wrote:
> I have a server that I screwed up iptables on. Now when the server
> restarts it locks up trying to apply the firewall rules. 
> 
> How can I remove the rules (set to all ACCEPT) in a linux rescue mode or
> knoppix or other way of getting to the file system? 
> 
> Any suggestions how to fix this?
> 

Those rules are stored in /etc/sysconfig/iptables, so you have some choices:

1) Boot into rescue mode, then do /sbin/service iptables stop, then exit 
to boot the system normally.  You'll have no firewall at this point. 
Create the rules as you want them (with iptables command), then do an 
/sbin/service iptables save to fix the file.

2) Boot into rescue mode, then edit /etc/sysconfig/iptables to make the
firewall what you wanted in the first place, then exit to boot normally.