Microsoft Windows – Configure SMB use of Netbios

With Windows 2000 the first move away from Netbios was made.

Instead DNS should be used for name resolution and SMB Direct Hosting at TCP/IP port 445 for requests instead of port 139.
By standard both port 139 and 445 is open to get the highest degree of compatibility.

A [gs client] will try to request on both ports and continue the communication on the port which responds first. To disable SMB use of Netbios port 139 (Forces use of port 445):

1. On the Start menu, point to Settings, and then click Network and Dial-up Connections
2. Right-click Internet facing connection, and then click Properties.
3. Select Internet Protocol TCP/IP and select Properties
4. Click Advanced and select the WINS tab
5. Tick Disable NetBIOS over TCP/IP and click Ok

[tab:445 (Disable Port)]

To Disable Port 445

To disable SMB use of port 445 with this DWORD (Forces use of port 139):

[HKEY_LOCAL_MACHINE / SYSTEM / CurrentControlSet / Services / NetBT / Parameters]
SMBDeviceEnabled = 0

[tab:139 and 445 (Disable Port)]

To Disable Port 139 and 445

To disable SMB use of port 139 and 445 (Disables nbt.sys driver):

1. Right-click My Computer on the desktop, and then click Manage.
2. Expand System Tools, and then select Device Manager.
3. Right-click Device Manager, point to View, and then click Show hidden devices.
4. Expand Non-Plug and Play Drivers.
5. Right-click NetBios over Tcpip, and then click Disable.

[tab:Disable SMB]

To Disable SMB

To disable SMB completely:

1. On the Start menu, point to Settings, and then click Network and Dial-up Connections
2. Right-click Internet facing connection, and then click Properties.
3. Select Client for Microsoft Networks, and then click Uninstall.
4. Follow the uninstall steps.
5. Select File and Printer Sharing for Microsoft Networks, and then click Uninstall.
6. Follow the uninstall steps.

[tab:END]