When using SConfig on a server core install, i was getting the following error

had similar issues when trying to configure the NIC using powershell.

Thanks very much to Mike and his post @ https://mikeconjoice.wordpress.com/2017/01/24/windows-server-core-error-swbemobjectex-invalid-index/

for pointing out that it was because IPv6 was not bound to the adapter.

Using the following powershell worked for me

Enable-NetAdapterBinding -Name Ethernet –ComponentID ms_tcpip6

the other important thing here is that unbinding IPv6 from adapters is a relatively common and completely silly practice. It frequently causes issues and doesn’t even achieve the goal of properly disabling IPv6 on the machine.

If you want to disable IPv6 – do it properly – via the registry as per

https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-ipv6-in-windows

Location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\
Name: DisabledComponents
Type: REG_DWORD
Min Value: 0x00 (default value)
Max Value: 0xFF (IPv6 disabled)