![]() Use the following steps to disable NetBIOS over TCP/IP. The first byte of this header is always 0x00, and the next 3 bytes are the length of the remaining data. In this situation, a four-byte header precedes the SMB traffic. NetBIOS over TCP traditionally uses the following ports:ĭirect hosted NetBIOS-less SMB traffic uses port 445 (TCP). This mechanism enables Windows to function properly with operating systems that don't support direct hosting of SMB traffic. 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. Removing the less secure NetBIOS protocol as a method of attack.Standardizing name resolution on DNS for file and printer sharing.Removing WINS and NetBIOS broadcast as a means of name resolution.Simplifying the transport of SMB traffic.Removing the NetBIOS transport has several advantages, including: ![]() SMB 1.0 and older CIFS traffic supported the NetBIOS over TCP (NBT) protocol supported the UDP transport, but starting in Windows Vista and Windows Server 2008 with SMB 2.0.2, requires TCP/IP over port 445. Windows supports file and printer-sharing traffic by using the SMB protocol directly hosted on TCP. This article describes how to direct host Server Message Block (SMB) over TCP/IP.Īpplies to: Windows Server 2012 R2 Original KB number: 204279 Summary ![]()
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