Bitcoin-Core, Linux, is not listening on port 8333. How do you fix that?
bitcoin.conf has
port=8333
#asknostr
Not listening on loopback or not listening on LAN?
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Not listening on any device.
Hmmm your firewall needs the port opened to listen on LAN or on the Web but it shouldn't block 127.0.0.1:8333
Try:
$ sudo apt-get install ufw
$ sudo ufw allow 8333
$ sudo ufw enable
Firewall is already good. The app should be listening on the port first before firewall comes into play.