HowTo Disable The Iptables Firewall in Linux

by on April 10, 2007 · 26 comments· LAST UPDATED June 28, 2012

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I need to disable firewall in Linux for testing purpose. I'm using CentOS and RHEL version 4.4 / 5 / 6. How do I disable the firewall in Linux?

A Linux firewall is software based firewall that provides protection between your server (workstation) and damaging content on the Internet or network. It will try to guard your computer against both malicious users and software such as viruses/worms.

Task: Disable / Turn off Linux Firewall (Red hat/CentOS/Fedora Core)

Type the following two commands (you must login as the root user):
# /etc/init.d/iptables save
# /etc/init.d/iptables stop

Turn off firewall on boot:
# chkconfig iptables off

Task: Enable / Turn on Linux Firewall (Red hat/CentOS/Fedora Core)

Type the following command to turn on iptables firewall:
# /etc/init.d/iptables start
Turn on firewall on boot:
# chkconfig iptables on

Check out related media

See firewall start and stop video tutorial:

A note about other Linux distribution

If you are using other Linux distribution such as Debian / Ubuntu / Suse / Slakcware Linux etc., try the following generic procedure. First, save the current firewall rules, type:
# iptables-save > /root/firewall.rules
OR
$ sudo iptables-save > /root/firewall.rules
Next, type the following commands (login as the root) as bash prompt:

 
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
 

Or create a shell script as follows and run it to disable the firewall:

 
#!/bin/bash
# reset.fw - Reset firewall
# set x to 0 - No reset
# set x to 1 - Reset firewall
# ---------------------------------------------------------------------------------------------------------------
# Added support for IPV6 Firewall
# ---------------------------------------------------------------------------------------------------------------
# Written by Vivek Gite <vivek@nixcraft.com>
# ---------------------------------------------------------------------------------------------------------------
# You can copy / paste / redistribute this script under GPL version 2.0 or above
# =============================================================
x=1
 
# set to true if it is CentOS / RHEL / Fedora box
RHEL=false
 
### no need to edit below  ###
IPT=/sbin/iptables
IPT6=/sbin/ip6tables
 
if [ "$x" == "1" ];
then
	if [ "$RHEL" == "true" ];
	then
	      # reset firewall using redhat script
		/etc/init.d/iptables stop
		/etc/init.d/ip6tables stop
	else
		# for all other Linux distro use following rules to reset firewall
		### reset ipv4 iptales ###
		$IPT -F
		$IPT -X
		$IPT -Z
		for table in $(</proc/net/ip_tables_names)
		do
			$IPT -t $table -F
			$IPT -t $table -X
			$IPT -t $table -Z
		done
		$IPT -P INPUT ACCEPT
		$IPT -P OUTPUT ACCEPT
		$IPT -P FORWARD ACCEPT
		### reset ipv6 iptales ###
		$IPT6 -F
		$IPT6 -X
		$IPT6 -Z
		for table in $(</proc/net/ip6_tables_names)
		do
			$IPT6 -t $table -F
			$IPT6 -t $table -X
			$IPT6 -t $table -Z
		done
		$IPT6 -P INPUT ACCEPT
		$IPT6 -P OUTPUT ACCEPT
		$IPT6 -P FORWARD ACCEPT
	fi
else
        :
fi
 

To restore or turn on firewall type the following command:
# iptables-restore < /root/firewall.rules

GUI tools

If you are using GUI desktop firewall tools such as 'firestarter', use the same tool to stop the firewall. Visit:
System > Administration > firestarter > Click on Stop Firewall button:
Sample outputs:
Howto disable the iptables firewall in Debian  / Ubuntu Linux

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{ 26 comments… read them below or add one }

1 mike November 23, 2007 at 2:37 pm

you can get the status of iptables with the following

service iptables status

service iptables help gives:

Usage: /etc/init.d/iptables {start|stop|restart|condrestart|status|panic|save}

Reply

2 hanumanaik February 9, 2011 at 8:14 am

how to insatall CentOS 4.3 in VMWere

Reply

3 Gregory May 3, 2011 at 2:16 pm

Same as on a machine…

Reply

4 Photos of China July 4, 2008 at 7:29 am

I have this error on centOS

/etc/init.d/iptables save
Usage /etc/init.d/iptables {start|output_int|stop|restart|status}

Reply

5 nixCraft July 4, 2008 at 8:19 am

Are you sure you got CentOS? Another option is
iptables-save > /root/working.fw

Reply

6 Flash32 October 30, 2008 at 4:06 pm

Thanks Guys!!!

Reply

7 Robert December 24, 2008 at 3:32 pm

The easy way to do this is:

chkconfig iptables off

then to re-enable

chkconfig –level 345 iptables on

Reply

8 joe January 5, 2009 at 7:56 pm

on fedora, once you enabled firwalls/selinux during installation, I can never make nfs boot or ftp works. you can see firewall disabled, iptables disabled, yet no help. Either selinux or fedora GUI has bugs, what I get:
Loading: TFTP error 2: Only absolute filenames allowed
Failed.
to our people, the selinux is a nightmare. forget what the system told you. selinux adds extension to file attributes then some garbage cannot be removed.

Reply

9 Amie January 7, 2009 at 8:32 pm

Hi – first time here and really need some help!

I gave my father in law a netbook for Xmas with Linux as an operating system but cannot connect to Sky broadband. Sky unable to help, any ideas??

Reply

10 Manu Anand January 9, 2009 at 11:36 pm

Hey Amie:

Try connecting with a ethernet cable.
If that works then try KDE’s network manager.

HTH
Manu

Reply

11 Tomas February 27, 2009 at 3:08 pm

Excellent!
Really Thanks

Reply

12 Ashwani April 9, 2009 at 1:50 am

Thanks for help….

FTP can be accessed by stop IP tables.

Reply

13 mallikarjun goud November 15, 2009 at 7:01 am

how to stop iptables with out chkconfig iptables off command………………..plz help me out

Reply

14 Kapil Ahire March 17, 2010 at 4:17 am

Thanks All Of you

Reply

15 Alex March 30, 2010 at 3:26 pm

Hi,

I have a problem starting iptables:

[root@myserver ~]# /etc/init.d/iptables start
[root@myserver ~]# /etc/init.d/iptables status
Firewall is stopped.

[root@myserver ~]# rpm -q iptables
iptables-1.3.5-5.3.el5_4.1

Please help me solve this problem.
Thanks!
Alex

Reply

16 neha soni April 3, 2010 at 11:06 am

how can we stop the iptables service in ubuntu???
i have tried “services iptables stop” but it is giving “unrecognized service”.
is there any other command or method to do so???

Reply

17 Yogesh Kumar April 16, 2010 at 5:19 am

/etc/init.d/iptables status

if running than to stop

/etc/init.d/iptables stop

Reply

18 vijay April 17, 2010 at 8:32 pm

HI,
I am very confused about iptables status.

I stopped my iptables by running ” service iptables stop”, later on i checked wheter it is really running or not by running “service iptables status”. It shows me ” Firewall is disabled”. If I run iptables -L it shows me the list of INPUT/OUTPUT/FORWARD Chains. If again i will run ” service iptables status” it will show me againall chains. What it really means, does iptables start auutomatically when I type ” iptables -L”? Please reply lots of confusion!!!

Thanks in advance.

Vijay

Reply

19 maansingh June 22, 2010 at 4:48 pm

dear sir ,
how can i configure the firewall

Reply

20 quan September 13, 2010 at 5:53 am

I make iptable stop but not start it
>>

[root@FreeSX ~]# /etc/init.d/iptables start
Applying iptables firewall rules: iptables-restore: line 1 failed
[FAILED]
[root@FreeSX ~]# /etc/init.d/iptables status
Firewall is stopped.

>>
plz help me as soon as possible
thks!!!!!!

Reply

21 Tyler April 19, 2011 at 8:10 pm

Debian Stable doesn’t seem to have an init.d script, or the services application, or the chkconfig application. How does one start/stop/restart the iptables service on Debian?

Reply

22 jokish May 13, 2011 at 3:35 pm

Thankss a lot ………………………….. gud to learn

Reply

23 ram November 6, 2011 at 7:40 pm

To stop firewall during bootup aka permanently

[root@ssd optimized]# chkconfig –list | grep iptables
iptables 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[root@ssd optimized]# chkconfig –level 345 iptables off
[root@ssd optimized]# chkconfig –list | grep iptables
iptables 0:off 1:off 2:on 3:off 4:off 5:off 6:off

Reply

24 Inversys November 12, 2011 at 5:12 pm

Excellent!
Thanks for all.

Reply

25 Harshal September 5, 2012 at 5:58 am

Thanks

Reply

26 Brian October 19, 2012 at 3:47 pm

For ubuntu/debian servers, it is better to run default policy change, “iptables -P INPUT ACCEPT” before “iptables -F”, otherwise you will lose current connections immediately if your default policy was set to DENY

iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X

This should be applied to the script file too.

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