#1138630 nut-monitor claims UPS was last known to be calibrating and currently is not communicating, assuming dead

Package:
nut-client
Source:
nut-client
Description:
network UPS tools - clients
Submitter:
Josip Rodin
Date:
2026-06-01 13:57:02 UTC
Severity:
normal
#1138630#5
Date:
2026-06-01 13:34:22 UTC
From:
To:
Hi,

One of my machines connected as a secondary went AWOL. It was shut down
after this sequence of events in the log:

May 29 23:19:15 mysecondary nut-monitor[4075438]: UPS nutdev3@myprimary.domain.tld: calibration in progress
May 29 23:19:15 mysecondary nut-monitor[155306]: Network UPS Tools upsmon 2.8.1
Jun 01 13:56:08 mysecondary nut-monitor[4075438]: Poll UPS [nutdev3@myprimary.domain.tld] failed - Server disconnected
Jun 01 13:56:08 mysecondary nut-monitor[4075438]: Communications with UPS nutdev3@myprimary.domain.tld lost
Jun 01 13:56:08 mysecondary nut-monitor[4075438]: UPS [nutdev3@myprimary.domain.tld] was last known to be calibrating and currently is not communicating, assuming dead
Jun 01 13:56:08 mysecondary nut-monitor[4075438]: Executing automatic power-fail shutdown
Jun 01 13:56:08 mysecondary nut-monitor[4075438]: Auto logout and shutdown proceeding
Jun 01 13:56:08 mysecondary nut-monitor[2735907]: Network UPS Tools upsmon 2.8.1
Jun 01 13:56:08 mysecondary nut-monitor[2735912]: Network UPS Tools upsmon 2.8.1
Jun 01 13:56:13 mysecondary nut-monitor[4075438]: Network UPS Tools upsmon 2.8.1

The primary at myprimary.domain.tld was idle throughout this time.
The secondary config is:

% sudo cat /etc/nut/nut.conf
MODE=standalone
% sudo cat /etc/nut/upsmon.conf
MONITOR nutdev3@myprimary.domain.tld 1 mysecondary censored secondary
SHUTDOWNCMD "/sbin/poweroff"

This sounds like it could be another manifestation of something like
https://bugs.debian.org/1056190 /
https://github.com/networkupstools/nut/issues/2168 ?

Either way, it seems to cause arbitrary downtime, so we probably shouldn't
have this in stable?

Please have a look. TIA.