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Linux Firewalls: How to Actually Secure a Cloud Server (iptables, nftables, firewalld, ufw)
(blog.hofstede.it)
This is a most excellent place for technology news and articles.
OpenSnitch is a nice for the desktop environment, deny by default and prompts the user when an application requests a open port, at first the prompts can get a little overwhelming given how many things want to connect to xyz server but eventually lightens up.
Its a little annoying on Linux but I wonder what it would be like on Windows.
Windows firewall already does prompt like this