Mnyb wrote: 
> What surprised me was that it has no memory backup for this ?
I don't think this has much to do with "memory".
I surmise either:
a - soft power off mode differs from cold power off in the network card
status
b - when the machine encounters a power failure event, somehow the bios
gets zapped to a factory config that has the NIC disabled in power off
mode

I've seen b) happen, but typically this would require many power
failures in a row (like a machine failing to boot a few times, and the
bios rolling back to failsafe defaults). Or a dead battery on the
motherboard (sensors should tell you that; or the date reported by the
machine early in the boot process.)
For me the most probable circumstance is a) and I would try 2 things:
1 - check there isn't a bios option to keep the network card active in
cold off mode.
2 - change the power failure mode to "restart", and rely on the OS power
management logic to bring the machine to soft-off again after a while.

I would prefer option 1) to work, by a mile. Power events rarely come
alone, it's probably better not to have the server get caught by a
secondary power failure while it is checking its disk drive due to the
1st unexpected restart...

(or perhaps you can get creative with the bios scheduled start feature
--like: every day at 10pm--, depending of how it behaves when the
machine is in soft-off mode, and how you can manipulate this setting
from the booted OS...)



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