This board appears to be old enough that no support is provided for Windows Server 2016 (there doesn't appear to be any support for Windows 10 either, BTW).
This message was posted on behalf of Intel Corporation
In regard to your question, the Intel’s support for the Intel® Gigabit ET Dual Port Server Adapter stopped on 12/30/2012. There are no drivers available for Windows® Server 2016. I am sorry for the inconvenience.
I am adding you the list of Intel® Ethernet Discontinued Adapters