Windows File Sharing: Facing the Mystery | Daniel Miessler
Mar 12, 2020 · Server Message Block (SMB), which runs over TCP port 445, is a network protocol that has been designed to enable file sharing, network browsing, printing services, and interprocess communication over a network. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2000/XP. In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP), which used the famous ports 137, 138 (UDP) and 139 (TCP). In Windows 2000/XP, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT Server Message Block Version 2 and 3. Abbreviation. SMBv2 / SMBv3. Known Ports. TCP 445 - SMB over TCP port. TCP 137 - SMB over TCP port (via NetBIOS). UDP 137 - SMB over UDP port (via NetBIOS). UDP 138 - SMB over UDP port (via NetBIOS). TCP 139 - SMB over TCP port (via NetBIOS). Category. File Server. External Resources. Windows SMB v2/v3
It uses the following TCP and UDP ports: - UDP port 137 (name services) - UDP port 138 (datagram services) - TCP port 139 (session services) NetBIOS over TCP/IP (NBT) is installed and enabled by default for backwards compatibility with old systems (or SMB implementations); however Microsoft SMB Protocol can be used without Microsoft NetBIOS.
Server Message Block Version 2 and 3. Abbreviation. SMBv2 / SMBv3. Known Ports. TCP 445 - SMB over TCP port. TCP 137 - SMB over TCP port (via NetBIOS). UDP 137 - SMB over UDP port (via NetBIOS). UDP 138 - SMB over UDP port (via NetBIOS). TCP 139 - SMB over TCP port (via NetBIOS). Category. File Server. External Resources. Windows SMB v2/v3 TCP Settings. Adjust MTU; Enable TCP Window Scaling (RFC 1323). Details here. Allow ports above 5000. Details here. Other Factors. SMB2 has performance advantages over SMB. Details here and here. General Resources. Performance Tuning Guidelines for Windows Server 2008 The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2000/XP. In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP), which used the famous ports Sep 07, 2017 · Port 445: It is used for SMB protocol (server message block) for sharing file between different operating system i.e. windows-windows, Unix-Unix and Unix-windows. For mail details read our previous article given below:-Penetration Testing in SMB Protocol using Metasploit; 4 Ways to Hack SMB Login Password; 4 ways to Connect Remote PC using SMB Port
With SMB over QUIC – I don’t have a clever marketing name for this yet :) – QUIC becomes the transport, optionally replacing TCP/IP and RDMA, as well as a tunnel securing all SMB payloads with encryption, even if SMB encryption is not enabled, all while multiplexing over port 443 to an enlightened share.
Jan 02, 2013 · It appears that when the DFS Management tool is activated, it creates a firewall exception called DFS Management (SMB-In) that allows access over TCP 445 to any IP address. Unfortunately, I also found that this local exception overrides the domain GP that I had set where I had explicitly limited this access for file and print sharing. Dec 20, 2017 · SMB runs directly over TCP (port 445) or over NetBIOS (usually port 139, rarely port 137 or 138). To begin an SMB session, the two participants agree on a dialect, authentication is performed, and the initiator connects to a ‘tree.’ For most intents and purposes, the tree can be thought of as a network share. Oct 01, 2009 · Port 445 provides SMB over TCP. From Microsoft "Windows supports file and printer sharing traffic by using the Server Message Block (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." Dec 05, 2018 · Remember, daemons aren’t useful unless requests can make it to them. That’s where SMB over TCP (or in the 9x world — NetBIOS over Netbeui or TCP/IP) come in. They are the means of getting requests over the network to the “server” machine, i.e. the box that has a folder or a printer shared out. The WannaCry TCP port 445 exploit returned the spotlight to the vulnerabilities in Microsoft's long-abused networking port. TCP port 445 runs server message block (SMB) over TCP/IP Mar 12, 2020 · Server Message Block (SMB), which runs over TCP port 445, is a network protocol that has been designed to enable file sharing, network browsing, printing services, and interprocess communication over a network. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2000/XP. In Windows NT it ran on top of NetBT (NetBIOS over TCP/IP), which used the famous ports 137, 138 (UDP) and 139 (TCP). In Windows 2000/XP, Microsoft added the possibility to run SMB directly over TCP/IP, without the extra layer of NetBT