Support for the NetBIOS protocol in Windows when running in a TCP/IP network. NetBIOS over TCP/IP (NBT) supports legacy applications that use the NetBIOS protocol as well as the NetBIOS name ...

First, we are blocking by default the use of NetBIOS\WINS\mailslot-based methods for DC-discovery. This behavior can be reverted with the use of a new Group Policy setting (BlockNetBIOSDiscovery).