issue for opening port on centos7

Something I commonly see is people who believe a port is blocked by a firewall appliance (i.e. iptables, router/switch level, etc) because it shows closed on something like

But, in all reality, many times it is because there is nothing listening on the port in the question, and for the correct protocol (IPv4/IPv6).

You can use something like `netstat` to check this, i.e. `netstat -nap | grep 8000`. Perhaps you can share the output of that command?

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