The CentOS system opens port 80 on the firewall.

Through/etc/init. d/iptablesstatus command to check whether port 80 is enabled. If no port 80 is enabled, you can use either of the following methods: 1. modify the vi/etc/sysconfig/iptables command to add make the firewall open port 80-ARH-Firewall-1-INPUT-mstate -- stateNEW-mtcp-ptcp -- dport80-jAC through/etc/init. d/ IptablesThe status command is used to check whether port 80 is enabled. If no port 80 is enabled, you can use either of the following methods:

1. modify the vi/etc/sysconfig/iptables command to add the firewall to open port 80
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 80-j ACCEPT

2. disable the firewall
/Etc/init. d/iptables stop

# Start
# Restart

Permanently disable the firewall
Chkconfig -- level 35 iptables off