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use below command
Block the port in firewall
firewall-cmd --permanent --add-rich-rule 'rule family=ipv4 source address=ipaddress port port=80 protocol=tcp reject'
firewall-cmd --reload
Open the port in firewall
firewall-cmd --permanent --remove-rich-rule 'rule family=ipv4 source address=ipaddress port port=80 protocol=tcp reject'
firewall-cmd --reload
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