Enable firewall port for centOS

CentOS enable and disable the firewall port in centOS firewall 1. enable the port (take Port 80 as an example) Java code Method 1: /sbin/iptables-IINPUT-ptcp -- dport80-jACCEPT write modify/etc/ini... centOS enable and disable the firewall port in centOS firewall 1. enable the port (take Port 80 as an example) Java code Method 1: /sbin/iptables-I INPUT-p tcp -- dport 80-j ACCEPT write modification/etc/init. d/iptables save and modify service iptables restart to restart the firewall. Method 2: vi/etc/sysconfig/iptables open the configuration file and add the following statement: -a input-p tcp-m state -- state NEW-m tcp -- dport 80-j ACCEPT restart the firewall. modification is complete. 2. disable Port Java code Method 1: /sbin/iptables-I INPUT-p tcp -- dport 80-j DROP write modification/etc/init. d/iptables save and modify service iptables restart to restart the firewall. Method 2: vi/etc/sysconfig/iptables open the configuration file and add the following statement: -a input-p tcp-m state -- state NEW-m tcp -- dport 80-j DROP restart the firewall. the modification is complete. 3. check the port status. Java code/etc/init. d/iptables status