Debian服务器有时候端口会失效，这是因为需要再防火墙打开特定的端口。
查看防火墙状态
iptables -L -n
添加端口
iptables -A INPUT -p tcp --dport /*port*/ -j ACCEPT
删除端口
iptables -D INPUT /*number*/ //iptables -L INPUT中的第几条规则
保存并重启
iptables-save > /etc/iptables.up.rules
/etc/init.d/ssh restart
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