今天装完开源邮箱服务（EwoMail）之后发现防火墙被屏蔽了，执行相关所有firewall的命令都失效，提示如下：
Failed to ** firewalld.service: Unit is masked.
执行下
systemctl unmask firewalld
即可解除屏蔽
国产开源太可怕.....
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