TCP connection and "Host is down"

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello,
since I upgraded a host to netbsd-10 (from -8), a long-running ssh connection
from a host on the same network eventually gets dropped with
sshd[16551]: process_output: ssh_packet_write_poll: Connection from user bouyer xx.xx.xx.xx port 56989: Host is down

the remote host may be unreachable because of network issues during some
nightly task, but certainly not for several minutes.
Shouldn't TCP ignore EHOSTDOWN error on established connections, and
close it after the ACK timeout instead ?

This didn't happen with netbsd-8.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--