The filer will still attempt to use NetBIOS to communicate with the domain controllers and may time out when port 139 is blocked. How can you force the filer to use Kerberos and port 445 to communicat...The filer will still attempt to use NetBIOS to communicate with the domain controllers and may time out when port 139 is blocked. How can you force the filer to use Kerberos and port 445 to communicate with the domain controllers instead of NetBIOS and port 139? In Windows NT it ran on top of NBT (NetBIOS over TCP/IP), which used ports 137, 138 (UDP) and 139 (TCP). If the domain controller has NBT enabled, it listens on UDP ports 137, 138, and on TCP ports 139, 445.
