防火墙你关了没有？ Oracle 默认是开启的，需要给它关闭掉
ubuntu关闭防火墙：
sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -F
Centos系统下：
删除多余附件
systemctl stop oracle-cloud-agent
systemctl disable oracle-cloud-agent
systemctl stop oracle-cloud-agent-updater
systemctl disable oracle-cloud-agent-updater
停止firewall
systemctl stop firewalld.service
禁止firewall开机启动
systemctl disable firewalld.service
