我的防火墙目前处于非活动状态。
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