I'm having a strange issue while trying to configure NUT on a CentOS 6 machine to control an Eaton 5E UPS.

I've taken the following steps

# yum install nut
# yum install usbutils

Then updated nut.conf


I confirmed that the UPS was visible

# lsusb

Bus 003 Device 006: ID 0463:ffff MGE UPS Systems UPS

Then updated ups.conf

    driver = usbhid-ups
    port = auto
    desc = "Eaton5E"
    vendorid = 0463

Then attempted to run the driver control which failed

# upsdrvctl start

Network UPS Tools - UPS driver controller 2.6.5
Network UPS Tools - Generic HID driver 0.37 (2.6.5)
USB communication driver 0.31
No matching HID UPS found
Driver failed to start (exit status=1)

When I tried to debug it though I got another error and I'm not sure why

# usbhid-ups -DDD -a eaton5e

*bunch of stuff*
0.000799     Trying to match device
0.000813     Device matches
0.001630     Unable to get HID descriptor (error sending control message: Broken pipe)
0.001636     HID descriptor, method 2: (9 bytes) => 09 21 10 01 21 01 22 25 02
0.001641     HID descriptor length 549
0.001890     Unable to get Report descriptor: Broken pipe
*more bunch of stuff*

I've been fighting this thing for a while now but without any luck, has anyone encountered this before?

  • Possibly a permission issue on some /dev/<mumble>. Enable debugging and use strace. Mar 10, 2017 at 10:18

1 Answer 1


I managed to fix this by doing the following

1.) copy (or symbolic link) the necessary rules to the correct location

# cp /lib/udev/rules.d/62-nut-usbups.rules /etc/udev/rules.d

2.) determine correct vendor id for ups

# lsusb
Bus 003 Device 006: ID 0463:ffff MGE UPS Systems UPS

3.) alter permissions in 62-nut-usbups.rules for correct ups

# vim 62-nut-usbups.rules
navigate to correct vendor id and update from
ATTR{idVendor}=="0463", ATTR{idProduct}=="ffff", MODE="664", GROUP="dialout"
ATTR{idVendor}=="0463", ATTR{idProduct}=="ffff", MODE="660", GROUP="nut"

4.) restart machine

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