The Debian project is in the process of adopting the OpenSnitch interactive firewall utility, which we reviewed just over a year ago. A request to include OpenSnitch as a package in Debian was submitted back in 2018 and the newly packaged software is now being tested and reviewed. OpenSnitch is an interesting tool because it allows users to address network activity as it happens, rather than setting up rigid rules ahead of time. As Chris Lamb wrote when the subject of including OpenSnitch in Debian first came up: "OpenSnitch works on the same principles of the macOS version, being a host-based firewall that notifies users when local apps are attempting to initiate new outgoing network connections. When this happens, OpenSnitch will display a popup, asking the user for instructions on how to deal with this new process."
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