SMB V2 Scanning – Newman Business Solutions
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
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
Server Message Block (SMB) is a network transport protocol for file systems operations to enable a client to access resources on a server. The primary purpose of the SMB protocol is to enable remote file system access between two systems over TCP/IP. SMB troubleshooting can be extremely complex.
Oct 01, 2009
Mar 08, 2018 · Hi David, TCP port 445 (used by SMB) became famous last year, because security hole was found in that port. So Microsoft and many antivirus vendors made efforts to block that port from something malicious . Mar 02, 2020 · Microsoft is working on Server Message Block (SMB) over QUIC technology for use with "Windows, Windows Server, and Azure Files," according to a Monday announcement. TCP and RDMA get used, but 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.