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| 之前是用这2条命令关闭防火墙
 
 
 复制代码systemctl stop firewalld.service#停止firewall
systemctl disable firewalld.service#禁止firewall开机启动
 刚刚新安装了一个 CentOS 7  ,运行这个命令提示 :
 
 
 复制代码[root@ccav ~]# systemctl stop firewalld.service
Failed to stop firewalld.service: Unit firewalld.service not loaded.
[root@ccav ~]# systemctl disable firewalld.service
Failed to execute operation: Access denied
[root@ccav ~]#
 我想改 SSH 端口,但是好像还是有防火墙存在。
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