Last week Microsoft quietly fixed a Windows update it recently released which prevents users from getting an IP and connecting to the Internet.
People are pointing the issue to update KB3201845 released on Dec 9 2016, which appears to break DHCP. This prevents Win 10 from automatically getting an IP address from the network.
KB4004227 has been released to resolve this issue.
“Note: This issue is limited to PCs running Windows 10 version 1607 that have not been restarted recently, and with network adapters unexpectedly showing an IP address in the 169.x.x.x range. ”
More info on MS forums.