Ufw Ctrl-C and Iptables: Chain Already Exists
I Did a Dumb Thing, So Bear with Me. While Running a Ufw Command to Add a Rule, I Did a Ctrl-C, This Led to the Problem of the Following Error Being Generated...
I did a dumb thing, so bear with me.
While running a ufw command to add a rule, I did a Ctrl-C, this led to the problem of the following error being generated every time I try to use UFW:
ERROR: initcaps
[Errno 2] iptables: Chain already exists.
I have done a search and can't find anything on how to clean it up, but I did find this bug report at: ufw errors after ctr+c interupt
While I do see it has been confirmed, is there anything I can do to clean this up until it is fixed? Every time I try to add a rule I get that error.
Thanks in advance for any help provided.
Edit: BTW, I already tried saving the user.rules file, uninstalling UFW, reinstalling UFW, and moving the user.rules file back. I thought it might clean up iptables. No success.
2 Answers
This worked for me from here
sudo ufw disable
sudo iptables -F
sudo iptables -X
sudo ip6tables -F
sudo ip6tables -X
sudo ufw enable
I hope it is helpful to someone, one day.
This is what I did to clean it up, if ufw is enabled, disable it. Then remove all of the ufw rules from iptables and ip6tables.
#! /usr/bin/env bash
set -e
set -o pipefail
iptables --flush
rules=($(iptables --list | grep Chain | grep -Eo "ufw-[a-z-]+" | xargs echo))
for i in "${rules[@]}"
do
iptables --delete-chain $i
done
ip6tables --flush
rules6=($(ip6tables --list | grep Chain | grep -Eo "ufw6-[a-z-]+" | xargs echo))
for i in "${rules6[@]}"
do
ip6tables --delete-chain $i
done
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
