CentOS7中啓用 iptables報 job for iptables.service failed because the cpntrol process exited with error

運行 systemctl restart iptables.service  #重啓防火牆使配置生效。

產生如下錯誤信息：job for iptables.service failed because the cpntrol process exited with error code.

解決方式，將下面指令挨着執行一遍：

 

service iptables save
systemctl stop firewalld
systemctl disable  firewalld
systemctl start iptables
systemctl status iptables
systemctl enable iptables