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Do you need to have a firewall on a linux desktop?
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this post was submitted on 06 Oct 2023
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Yes, except that whether you do is not at all obvious.
Do you use KDE Connect? If yes, you run a network service. Syncthing, a bittorrent client? Those too, and many others. I know this is a Linux community, but as a comparison windows has a bunch of network services running by default.
By saying "network services", I think menu of us would just think about a web server or a file server, conclude that they don't run any of those, and don't bother with it.
When in doubt,
sudo netstat -lutpn, and look for the listening ports to see what software listens for informing requests.