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This article describes how to direct host Server Message Block (SMB) over TCP/IP.
Original product version: Windows Server 2012 R2
Original KB number: 204279
Original KB number: 204279
Summary
Note: This might seem counter-intuitive, but if you set your network profile to public, your system will automatically stop printer & file sharing over the network. Repeat the procedure above with every computer that is connected to this particular network. Connecting via Wi-Fi adapter Press Windows key + R to open up a Run dialog box. This article describes how to direct host Server Message Block (SMB) over TCP/IP. Original product version: Windows Server 2012 R2 Original KB number: 204279. Windows supports file and printer sharing traffic by using the SMB protocol directly hosted on TCP.
Windows supports file and printer sharing traffic by using the SMB protocol directly hosted on TCP. This differs from earlier operating systems, in which SMB traffic requires the NetBIOS over TCP (NBT) protocol to work on a TCP/IP transport. Removing the NetBIOS transport has several advantages, including:
- Simplifying the transport of SMB traffic.
- Removing WINS and NetBIOS broadcast as a means of name resolution.
- Standardizing name resolution on DNS for file and printer sharing.
If both the direct hosted and NBT interfaces are enabled, both methods are tried at the same time and the first to respond is used. This allows Windows to function properly with operating systems that don't support direct hosting of SMB traffic.
More information
NetBIOS over TCP traditionally uses the following ports:
- nbname: 137/UDP
- nbname: 137/TCP
- nbdatagram: 138/UDP
- nbsession: 139/TCP
Direct hosted NetBIOS-less SMB traffic uses port 445 (TCP and UDP). In this situation, a four-byte header precedes the SMB traffic. The first byte of this header is always 0x00, and the next 3 bytes are the length of the remaining data.
File And Printer Sharing Xp
Use the following steps to disable NetBIOS over TCP/IP; this procedure forces all SMB traffic to be direct hosted. Take care in implementing this setting because it causes the Windows-based computer to be unable to communicate with earlier operating systems using SMB traffic:
- Select Start, point to Settings, and then click Network and Dial-up Connection.
- Right-click Local Area Connection, and then click Properties.
- Click Internet Protocol (TCP/IP), and then click Properties.
- Click Advanced.
- Click the WINS tab, and then click Disable NetBIOS over TCP/IP.
Server Service File And Printer Sharing Ports Blocked Number
You can also disable NetBIOS over TCP/IP by using a DHCP server with Microsoft vendor-specific option code 1 (Disable NetBIOS over TCP/IP). Setting this option to a value of 2 disables NBT. For more information about using this method, see the DHCP Server Help file in Windows.
To determine if NetBIOS over TCP/IP is enabled on a Windows-based computer, issue a
net config redirector
or net config server
command at a command prompt. The output shows bindings for the NetbiosSmb device (which is the NetBIOS-less transport) and for the NetBT_Tcpip device (which is the NetBIOS over TCP transport). For example, the following sample output shows both the direct hosted and the NBT transport bound to the adapter:Server Service File And Printer Sharing Ports Blocked On Mac
NetBT_Tcpip is bound to each adapter individually; an instance of NetBT_Tcpip is shown for each network adapter that it's bound to. NetbiosSmb is a global device, and isn't bound on a per-adapter basis. This means that direct-hosted SMB's can't be disabled in Windows without disabling File and Printer Sharing for Microsoft Networks completely.