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
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:
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Category | List of Unix and Linux commands |
---|---|
File Management | cat |
Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
Network Utilities | dig • host • ip • nmap |
OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
Package Manager | apk • apt |
Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
Searching | grep • whereis • which |
User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
WireGuard VPN | Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
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}
how to insatall CentOS 4.3 in VMWere
Same as on a machine…
I have this error on centOS
/etc/init.d/iptables save
Usage /etc/init.d/iptables {start|output_int|stop|restart|status}
Are you sure you got CentOS? Another option is
iptables-save > /root/working.fw
Thanks Guys!!!
The easy way to do this is:
chkconfig iptables off
then to re-enable
chkconfig –level 345 iptables on
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.
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??
Hey Amie:
Try connecting with a ethernet cable.
If that works then try KDE’s network manager.
HTH
Manu
Excellent!
Really Thanks
Thanks for help….
FTP can be accessed by stop IP tables.
how to stop iptables with out chkconfig iptables off command………………..plz help me out
Thanks All Of you
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
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???
/etc/init.d/iptables status
if running than to stop
/etc/init.d/iptables stop
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
dear sir ,
how can i configure the firewall
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!!!!!!
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?
Thankss a lot ………………………….. gud to learn
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
Excellent!
Thanks for all.
Thanks
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
This should be applied to the script file too.
Thank You Very Much.
Thanks. It helped me. :)