Further to this, I have found the relevant debug message at the time of error. Paste here: https://pastebin.com/BzCvXbWj

The first unexpected log is this:

106432.128011   [D3] read: Overflow (-8)

The below commands can be run while the driver is running, so a workaround for this case may be to run them preemptively.

I expect this to not be the fault of Nut, however given that the host did not change between UPS replacement, this may be a new behaviour of Salicru units that might need to be handled?

Thank you for the insight,

On 19/04/2025 09:35, S Shaikh via Nut-upsuser wrote:
I have run DMESG during the disconnect and there were no messages during the time of disconnection. I ran: dmesg -w -T to follow the output.

However resetting the USB device worked, so at least now I can now save a reboot:

$ echo 0 | sudo tee /sys/bus/usb/devices/1-4/authorized
0
$ echo 1 | sudo tee /sys/bus/usb/devices/1-4/authorized
1

I am yet to try a new port/cable (the host is offsite).

On 11/04/2025 22:04, Greg Troxel via Nut-upsuser wrote:
You really need to look at kernel-level messages.

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