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LuLu: An open-source macOS firewall that blocks unknown outgoing connections

objective-see.com Software & code Software projects Security & privacy Class of 2021-01 Hall of Fame
Screenshot of objective-see.com captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
5
submitters
5
observed span
2017–2021
peak thread · 238 comments
804 pts
latest 20+ return · 2021-01-12
364 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

What I want for all these services (Little Snitch, ESET, etc) is an EasyList-like ... list. A community-aggregated and reviewed list of servers that don't merit my connection. I'd pay a monthly subscription fee for that. I'd also like separate lists for * "this wifi is public, be extra cautious" * "this wifi is public, be nice and don't torrent, do backups, etc" * "I'm on a metered connection (e.g. LTE), don't run torrents, backups, etc" edit: for anyone looking…

Be aware there are a few concerning open issues like it blocking all network requests when disabled: https://github.com/objective-see/LuLu/issues/264 or not being able to login after installing (due to security patch needing to be installed) https://github.com/objective-see/LuLu/issues/284

shusson·364-point thread·

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
1175

reference only — not used in Hall rules or ranking

Total comments
388

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2017-09-12LuLu – free and open source macOS firewallsashk30
2017-09-18LuLutouart10
2018-01-19LuLu: An open-source macOS firewall that blocks unknown outgoing connectionsFirst breakout · Best threadmcone804238
2019-08-10Lulu – free, open-source macOS firewallbased230
2021-01-12Lulu – Mac open-source firewall that aims to block unknown outgoing connectionsHall induction · Latest 20+ point returntambourine_man364150