-A INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j ACCEPT

 -A INPUT -j REJECT --reject-with icmp-host-prohib

service  iptables  status        查看防火墙状态

service  iptables  start           开启防火墙

service  iptables  stop           关闭防火墙

service  iptables  restart        重启防火墙

 

 

这样启动后远程连接会报错： ORA-12514:TNS:listener does not currently know of service requested in connect descriptor问题原因：数据库实例没注册到listener解决方法一：在listener.ora里面添加了一行SID_LIST_LISTENER =  (SID_LIST =    (SID_DESC =    (GLOBAL_DBNAME = orcl)  (SID_NAME = orcl)  ))