I have Laptop Dell Latitude E6430 and download Prosetx64 version 20.5. Post install, in VLAN Tab, add 2 VLAN (14 - 2) and in my Network Connection both show Disabled.
I check my switch Cisco and the port is in trunk mode. Connect a host with Windows 2012 R2 and not show error.
My problem is with laptop, I test with other version 18,5 and the same problem. The NIC show disabled.
Thanks for your help-
The 82579LM is onboard NIC on the laptop thus it is recommended to contact the Dell support for customized driver on your laptop. The drivers available on our website are generic version for Intel network adapters or ethernet controller,for best driver support you can contact OEM vendor. Please see below website for reference:
http://www.intel.com/content/www/us/en/support/network-and-i-o/ethernet-products/000006628.html?wapkw=oem+network Intel® Network Connection Support Options
Hope this clarified.