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Add port open
firewall-cmd --zone=public --add-port=9999/tcp --permanent
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Check if the port is open
firewall-cmd --query-port=9999/tcp
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Restart firewall
firewall-cmd --reload
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Query all open ports:
firewall-cmd --list-port
Linux system opens ports for firewall
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Origin blog.csdn.net/q18729096963/article/details/108405892
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