"Listening" means that some program is waiting on that port for connections, which means the port is blocked for other porgrams.
Behing 'listening' there should be a number, which is the PID (process ID) of the program that is using (listening on) the port.
The link i gave also describes how to get the name of the porgram from that number ("How to match the process ID to a program").
Once you know which software is blocking the port, you can decide on a solution:
Killing the program once when you want to play FAF
Uninstalling the program permanently
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