It would be good to have a little more about your hardware, have you rebooted since plugging in the UPS, what have you tried? It looks like nothing based on the face value of your posting. Did you try to turn off and on the service?
I suspect you have not had any responses to to your lack of information in your posting. Please read Joes Rules in my signature for advice on writing a post to ask for help.
Best of luck.
I think this problem appears on the latest versions on Scale.
Two things:
- The screen image above, how about scrolling the screen to the right and look for the Start Automatically section of the screen.
Out of curiosity, did the UPS NUT connection ever work on previous versions?
This is an odd problem, but we see odd problems here.
A possible solution…
- Back a backup of your configuration file.
- Reinstall TrueNAS to your Boot Drive using the iso image.
- Restore your configuration file.
Now can you get the UPS to communicate?

