这是因为防火墙的原因，把响应端口开启就行了。
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT#mysql port -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT#nginx -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT#tomcat -A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 5005 -j ACCEPT#ssh port -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT#vsftpd -A INPUT -m state --state NEW -m tcp -p tcp --dport 61001:62000 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --sport 61001:62000 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 20 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --sport 20 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A OUTPUT -m state --state NEW -m tcp -p tcp --sport 21 -j ACCEPT-A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
二、参考文件
1.Centos6.8 防火墙设置
2.CentOS 6上 iptables 防火墙的基本配置教程
3.为CentOS 6设置IPTables防火墙
4.Centos6.8防火墙配置
5.CentOS7安装iptables防火墙
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函数)
在运行时的相互关系)
