Can't shell into leaf on IPv6

[Pierre Abbat]

$ ssh -6 leaf.dragonflybsd.org
ssh_exchange_identification: read: Connection reset by peer

$ ssh -4 leaf.dragonflybsd.org
Last login: Sat Nov  3 18:31:40 2018 from 2001:5b0:211c:3

This happens on both DragonFly and Linux. Any idea why?

Pierre
-- 
Por H o por B, los campos magnéticos se difieren dentro de un imán.