How to open port and change SSH port on Almalinux 9 with Firewalld | VPS Tutorial
The open port is a network port on which the application listens, acting as a communication endpoint. We can view the list of open ports on the system by querying the network stack with commands such as ss, netstat, or lsof. Each listening port can be opened or closed (filtered) by a firewall.
By default, port 22 is used to establish an SSH connection. This port is automatically configured during the installation of your operating system.
To reduce the number of brute force attacks, you can configure another port for SSH access.
https://green.cloud/docs/how-to-open-...
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