On January 8th, Microsoft released the KB4480960 and KB4480970 updates for Windows 7 SP1 and Windows Server 2008 R2 SP1, which have been causing networking and licensing havok for users and organizations that have installed them.

https://www.bleepingcomputer.com/news/microsoft/windows-kb4480960-and-kb4480970-updates-causing-network-and-license-problems/