Enable, disable, and open specified ports for centos Firewall

Summary of centos firewall (for details about other Linux releases)
View Firewall Information
/Etc/init. d/iptables status

Enable specified port
/Sbin/iptables-I input-P TCP -- dport 8080-J accept
/Etc/rc. d/init. d/iptables save
Or
Edit/etc/sysconfig/iptables to add a row:
-A RH-Firewall-1-INPUT-M State-State new-m tcp-p tcp-dport 8080-J accept # You can also use-I input-P TCP -- dport 8080-J accept

Make the changed firewall effective
/Etc/init. d/iptables restart # It is not recommended to restart the system.
Disable the Firewall Service
/Etc/init. d/iptables stop

Permanently disable the Firewall
Chkconfig-level 35 iptables off # This method is originated from the network and is not tested. Therefore, you are not allowed to use this method for security reasons.