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FirewallD in CentOS 7
Before attempting to disable or reconfigure the firewalld have in mind that you need a user with the appropriate sudo privileges.
How to verify the Firewall Status:
Open the Terminal and run the "sudo firewall-cmd --state" command. This will list the status. Screenshot below:
How to disable the FirewallD
In order to temporarily stop the FirewallD service please use this command: "sudo systemctl stop firewalld" and how to disable it when booting the machine up: "sudo systemctl disable firewalld":
Usually there are other services that may try to start the firewall, so better masking it like: "sudo systemctl mask --now firewalld", screenshot attached as well ;)
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