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    Tutorial How to open port in CentOS | RedHat 7 / 8 and failed to start firewalld service unit is masked

    Mask link is broken One of the common reasons for the error is when starting the service the masked link is broken. Thus we need to link the mask location once again to resolve the error. But before you should install firewalld. You can use yum for that: sudo yum install firewalld To unmask...
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