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I'm running the latest OPNsense 25.1.7_2-amd64 and the issues below occurred on the previous 25.1.6

I had NUT running fine for quite a while in Netclient mode connected to a Cyberpower UPS that is connected to a Synology NAS.

I got a second CyberPower UPS this week with the OPNsense NUC now being powered by it (previously it wasn't UPS protected as it's on a different floor to the Synology). So now I wanted OPNsense to work in Standalone mode connected to the USB UPS that's right next to it.

In the NUT UPS Type tab I unticked Netclient, saved and restarted the service, then Enabled Standalone and the USB-HID Driver option, plugged in the USB into the OPNsense NUC and restarted the service.

The Diagnostics shows it's still connected to the Netclient mode UPS in the garage and it won't recognise the standalone UPS plugged into the USB port. I tried all sorts of combinations and it always showed it was still connected via netclient.

So I uninstalled NUT, reinstalled it and rebooted OPNsense. Immediately when OPNsense starts up, it shuts down. It look me a few restarts to quickly go into the GUI and disable NUT to prevent the loop.

Here's the log when it starts then shuts down - 192.168.1.252 is the Synology NAS

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2025-05-21T14:47:52 Notice kernel ---<<BOOT>>---
2025-05-21T14:47:52 Notice syslog-ng syslog-ng starting up; version='4.8.2'
2025-05-21T14:46:19 Notice kernel <6>ovpns1: link state changed to DOWN
2025-05-21T14:46:18 Notice syslog-ng syslog-ng shutting down; version='4.8.2'
2025-05-21T14:45:56 Notice upsmon Auto logout and shutdown proceeding
2025-05-21T14:45:56 Critical upsmon Executing automatic power-fail shutdown
2025-05-21T14:45:56 Notice upsmon UPS ups@192.168.1.252:3493: forced shutdown in progress
2025-05-21T14:45:51 Notice configctl event @ 1747802750.95 exec: system event config_changed response: OK
2025-05-21T14:45:51 Error upsmon Login on UPS [ups@192.168.1.252:3493] failed - got [ERR ACCESS-DENIED]

So even though I have disabled Netclient mode, it's still trying to connect, it fails, then 5 seconds later it decides to shutdown.

Looking at the logs, at one stage it did recognise the UPS via USB, but disconnected/attempted again which I discovered by googling that some Cyberpower UPS do this until they connect to the driver?

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2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0 (disconnected)
2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0
2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0 (disconnected)
2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0
2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0 (disconnected)
2025-05-21T14:34:59 Notice kernel ugen0.2: <CPS BR1200ELCD> at usbus0
Any suggestions would be appreciated - I'm not too keen to re-enable NUT as I think it will shutdown as soon as I enable it?

For further testing, have you tried renaming to wan rather than WAN ?

Yes, working fine on Protectli FW2B with Intel Celeron J3060.

I have a Protectli VP2410 with a Intel Celeron J4125 - which os-cpu-microcode should I select as the OPNsense version architecture is AMD64 while it has Intel CPU? Thanks