Turn off the CentOS firewall with the command line

#/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT  

#/sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT  

#/etc/rc.d/init.d/iptables save 

After restarting the computer, the firewall has opened two ports 80 and 22 by default.

 

Temporarily turn off the firewall completely without restarting the machine:

#/etc/init.d/iptables status ## View firewall status

#/etc/init.d/iptables stop ## This time close the firewall

#/etc/init.d/iptables restart ## Restart firewall

Permanently turn off the firewall:

#chkconfig --level 35 iptables off ## Note that there are two small British dashes in the middle; reboot