Hi, fellow unRAIDers!
A few days ago I wanted to implement some cable management, so after safely shutting down my unRAID tower I disconnected its power plug from my UPS (APC Back-UPS 700VA) and then disconnected all my USB devices, including the UPS's USB cable. After organizing the cables and putting everything back together, I booted up unRAID and everything was working properly, including all other USB devices - however I got an alert saying "UPS Alert - Warning communications lost with UPS".
I have tried fully powering down the tower, rebooting it normally, using different USB ports, using different cables, turning the UPS daemon on and off repeatedly, turning the UPS itself off and on - all to no avail. The UPS doesn't seem to appear in the device list, however I noticed that every time I connected the UPS's USB cable, I would get the following line in my syslog:
Sep 25 02:58:05 Tower apcupsd[6383]: Communications with UPS lost.
Disconnecting the cable gives no log entry, but connecting it does - this seems to imply that the system recognizes that the device is supposed to be a UPS, even though it doesn't appear in the device list? Very odd behaviour.
I'm pretty much out of ideas now, and having the UPS work properly is really important. I would be very grateful for a point in the right direction.
tower-diagnostics-20170925-0307.zip