[Nut-upsuser] nut-client connection refused on proxmox

[Jens Naber]

Hi all,

I installed the nut server successfully on a raspberry pi connected to my
ups. in my upsd.conf I added "LISTEN 0.0.0.0 3493", I added an admin and an
observer user.
I have 3 clients running, which should connect to the server via nut-client
and in 2 out of 3 cases it works as it should. I have a NAS connected and
PeaNUT running in a docker container. The nut server, NAS and PeaNUT are
all able to see the ups when running "upsc server-ups".

Now to the problem: I have a Proxmox server running which should also
connect as a nut-client. I installed and configured everything the same as
on the other systems. I can ping the nut server from the Proxmox system, I
can ssh to it and I even tried telnet to the 3493 port and everything works
fine. I even tried running upsc -l and got the following:

root at pve-1:/etc/nut# upsc -l 192.168.0.19
Init SSL without certificate database
server-ups

But trying to connect to the server and read the ups I only get the
following error:

root at pve-1:/etc/nut# upsc server-ups
Error: Connection failure: Connection refused

I'm completely out of ideas where to look and searching google was not much
help. As two systems work as expected and the Proxmox system can see the
nut server just fine I have no idea where to look next.

I hope someone here can help me out.

Thanks in advance!

Cheers,
Jens
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