Kermit68
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Kermit68's post in Direct connection to local PC not resumed by Unraid was marked as the answerI finally resolved my issue so I leave here some info that could be helpful for others in the future.
Short version: replace the SFP+ transciever
Longer version: after updating all possible drivers and firmware of the Dell x710 NIC I started to wonder if the problem could have been originated by the transciever. First easy check has been swapping the transciever on the Unraid server with the one in the Win11 PC but no difference. Then I looked on Amazon for a cheap SFP+ Intel compatible so I bought this QSFPTEK transcier https://amzn.eu/d/hxutLY7 and replaced on the Unraid NIC the 10Gtek transciever I was currently using https://amzn.eu/d/icu9FF3.
Bingo, it works. Or actually I'm not sure it's working properly as the Unraid server now never detects that the link is down when the Win11 PC is off, but on the other hand the connection works when I switch on he PC which, after all, is what I wanted.
Mind the transciever....not only the NIC 😁