systemctl status firewalld

systemctl start firewalld

systemctl stop firewalld.service

systemctl enable firewalld.service

firewall-cmd --permanent --zone=public --add-service=http

firewall-cmd --permanent --zone=public --add-service=https

firewall-cmd --permanent --zone=public --add-port=[your port]/tcp

firewall-cmd --reload

netstat -tunlp |grep [port]