As the title says. Upgraded Bookworm > Trixie, and now ssh is hanging 10 seconds at login, via home local network, when it never used to.
2025-08-17T16:07:29.828339+10:00 debian sshd-session[4260]: debug3: monitor_read: checking request 22 2025-08-17T16:07:29.829163+10:00 debian sshd-session[4260]: debug3: mm_answer_keyallowed: entering 2025-08-17T16:07:29.830353+10:00 debian sshd-session[4260]: debug1: temporarily_use_uid: 0/0 (e=0/0) *note 10 seconds between actions* 2025-08-17T16:07:38.982142+10:00 debian sshd-session[4260]: debug1: restore_uid: 0/0 2025-08-17T16:07:38.983847+10:00 debian sshd-session[4260]: debug1: temporarily_use_uid: 0/0 (e=0/0) 2025-08-17T16:07:38.984723+10:00 debian sshd-session[4260]: debug1: trying public key file /root/.ssh/authorized_keys 2025-08-17T16:07:38.987609+10:00 debian sshd-session[4260]: debug1: fd 11 clearing O_NONBLOCK Loglevel DEBUG3. Before the upgrade, it never hung. Now it hangs for 10 seconds nearly every login, but not every login. I have set UseDNS no, UsePAM no in sshd_config. I have diffed sshd_config's and there's no setting changes or additions. I've disabled IPV6 in /etc/sysctl.conf with
net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 It doesn't appear to be the hard drive spinning down; although hdparm is set to only 120, it does it if I log in, and immediately open another session. Any tips are appreciatedFor what it's worth, running ps is also often slow to respond, taking 10 seconds to output anything. This is a Seagate nas system that has run flawlessly in the past. It doesn't appear to be a process hogging cpu cycles or ram; the nas has a very average processor that, when taxed, makes the fan run at high speed. This is not occurring, top shows load average: 0.18, 0.21, 0.17 and MiB Mem 489.9 total, 132.3 free, 142.6 used, 244.6 buff/cache.