我的防火墙目前无效.

systemctl status firewalld firewalld.service Loaded: masked (/dev/null) Active: inactive (dead)

我使用以下命令启用防火墙

# systemctl unmask firewalld

但是我收到了这个错误:

# systemctl unmask firewalld

Failed to issue method call: Access denied

# sudo systemctl restart firewalld

Failed to issue method call: Unit firewalld.service failed to load: No such file or directory.

# sudo systemctl enable firewalld

Failed to issue method call: Access denied

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