6.12.2 modified my network settings, making web access impossible

Did you check the /logs directory of your flash drive ?

Any command line diagnostics should be stored there.

And there they are

unraid-diagnostics-20230710-1657 2.zip

All NICs are failing to initialize with the same error, most likely some kernel/driver incompatibility:

 

Jul 10 16:47:58 Unraid kernel: e1000e 0000:06:00.0: Unable to change power state from D3cold to D0, device inaccessible
Jul 10 16:47:58 Unraid kernel: e1000e 0000:06:00.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
Jul 10 16:47:58 Unraid kernel: e1000e 0000:06:00.0 0000:06:00.0 (uninitialized): Failed to initialize MSI-X interrupts.  Falling back to MSI interrupts.
Jul 10 16:47:58 Unraid kernel: e1000e 0000:06:00.0 0000:06:00.0 (uninitialized): Failed to initialize MSI interrupts.  Falling back to legacy interrupts.
Jul 10 16:47:58 Unraid kernel: e1000e: probe of 0000:06:00.0 failed with error -2

 

Is there anything I can do? I assume the drivers are part of the Unraid software and not something I can update via motherboard BIOS?

2 minutes ago, ZERØ said:

Is there anything I can do?

Likely not much, suggest trying a future new Unraid release, with a newer kernel, hopefully it will start working the same way it stopped.

Ok, thanks for the help, I'll wait for a new release and try again. At least now I know the issue and won't spend much time troubleshooting if it happens again.

Forgot to mention that a BIOS update and/or CMOS reset may also be worth trying, IIRC a user with a similar issue fixed it by moving the NIC to a different PCIe slot, you cannot do that but a BIOS change could make a difference.

6.12 combined all my NICs into one NIC. It would sometimes work, sometimes it wouldn't be assigned a mac address. I updated the motherboard bios from 1.2 to 1.2a and now I see all four NICs again.