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It listens on a socket for failed login notifications from other daemons. I'd say this approach is better than what fail2ban does (scans logs with regexps), but it has to be supported upstream so the daemons actually notify blacklistd.

Here's a (~24m) talk by the author about blacklistd at the last vBSDcon: https://m.youtube.com/watch?v=fuuf8G28mjs

To me, it seems kinda novel but I can't see myself ever using it across my production servers.

The FreeBSD Foundation's projects update from earlier this year has an introductory summary: https://www.freebsdfoundation.org/blog/february-2017-project...