[Nut-upsuser] NUT Client Not Working, Server OK

Charles Lepple
Mon, 31 Jan 2022 03:29:16 -0000

[please keep the list CC'd - probably easiest via Reply-All]

On Jan 28, 2022, at 10:20 AM, William Cole wrote:
> However, when executing sudo service nut-client on the Client PC, still
getting a Connection refused message:
>
> upsmon[491] UPS [APCES750Client at 192.168.1.101]:connect failed:
Connection failure: Connection refused
> (repeated 9 times)

"Connection refused" is a standard network error message that says
that either a firewall is blocking the port, or no daemon is currently listening
on that port. Since both ends of this connection are on the same host, a
firewall is not particularly likely to be blocking this, but you could always
change it to use 127.0.0.1 (localhost) if there is a firewall that can't
easily be changed.

In the case of the client Pi, you mentioned that ups.conf was originally empty.
You may need to restart upsd (sudo "service nut-server restart", I
think) now that it has an entry for the locally connected UPS. upsd listens on
the port that NUT clients like upsmon and upsc connect to.

- Charles