How to open and close ports on CentOS 8 (Linux VPS) | VPS Tutorial
While using Linux VPS, the firewall on CentOS 8 is enabled by default allowing for only a few services to receive incoming traffic. Firewalld is a powerful and yet simple-to-use tool to manage a firewall on CentOS 8 Server. Firewalld allows managing open or close ports using predefined services as well as open and close user custom ports.
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centos 8
How to check for open porta