Hello Richard,
Thank you for the details, they're helpful.
Could you check in Device Manager if you see the Dell Gigabit adapter installed and "working" in the network adapters?
If so, but you don't see a Network Adapter in Windows, then you most likely have an anti-virus blocking the addition of that new adapter for your alleged safety...
That product does not support Jumbo frames. You also need to have full duplex available.
If you use auto-negotiation on network devices, both sides must be configured as auto-neg.
Kind regards,
Alban
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