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When connecting to the server via SSH, first check whether the firewall is enabled.
View firewall status:
systemctl status firewalldSeeing the active (running) instruction has been opened
If not, turn on the firewall:
systemctl start firewalldView all open ports in the firewall:
firewall-cmd --zone=public --list-portsOpen port, for example, I want to open port 8888:
firewall-cmd --zone=public --add-port=8888/tcp --permanentIf you need to close this port:
firewall-cmd --zone=public --remove-port=8888/tcp --permanentRestart the firewall to make the configuration take effect:
firewall-cmd --reloadIf you want to turn off the firewall:
systemctl stop firewalldSet the startup firewall:
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