Use this command to find your active zone(s): firewall-cmd –get-active-zones It will say either public, dmz, or something else. You should only apply to the zones required. In the case of dmz try: firewall-cmd –zone=dmz –add-port=2888/tcp –permanent Otherwise, substitute dmz for your zone, for example, if your zone is public: firewall-cmd –zone=public –add-port=2888/tcp –permanent Then…
Centos 7 Firewall open a port
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