Intel l211 NIC + Windows 10 Pro 1803 = Broken TCP Checksum Offload?

Hello everyone,

My desktop motherboard uses an Intel l211 network adapter and on Windows Pro 1803 (with the latest 23.2 driver, but also with 23.1) I've noticed that TCP Checksum Offload cannot be enabled at all via Device Manager -> Advanced Adapter Settings or Windows PowerShell.

On Advanced Adapter Settings, the options seem to be set to Disabled by default, but once I set them to something else and apply the settings, the window is closed, connection is lost for a few seconds, and once I open the Settings page once again, the options are back to Disabled.

Then, I tried using Enable-NetAdapterChecksumOffload on Windows Powershell, but when I try reading the new values with Get-NetAdapterChecksumOffload, I see everything set to Disabled.

Any ideas?

Thanks!