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.
CompTIA Series - Internet Ports - Interface Technical Training TCP/UDP: 139: SMB (Server Message Block)Also Netbios Session Service: SMB over NetbiosTCP/UDP: 143: IMAP: TCP/UDP: 161: SNMP: UDP (TCP) 389: LDAP: TCP: 443: HTTPS (SSL/TLS/FTPS) TCP: 445: SMB: SMB over TCP (No need for Netbios layer) 500: IPSEC: IKE /ISAKMP: UDP/TCP: 636: Secured LDAP (LDAPS) TCP: 989: FTPS FTP over TLS/SSL DATA: TCP/UDP: 990 How to Disable NetBIOS Over TCP/IP and LLMNR Using GPO Dec 04, 2017
Preventing SMB traffic from lateral connections and
Local Firewall Policies Overriding Domain Group Policies Jan 02, 2013 CompTIA Series - Internet Ports - Interface Technical Training
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 .
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. All "File and Printer Sharing" on a Windows machine runs over this port. About 10% of all users on the Internet leave their hard disks exposed on this port. Port 445 SMB. In Windows 2000, Microsoft has created a new transport for SMB over TCP and UDP on port 445. This replaces the older implementation that was over ports 137, 138, 139. Most SMB/CIFS network traffic by volume occurs over TCP. This includes copying files, directory listings and printer related operations. For Windows NT4 and below, all this traffic occured over TCP port 139. This has been allocated the network service name netbios-ssn by the Internet Assigned Numbers Authority (IANA). SMB is an application interface network protocol while CIFS is a TCP/IP Protocol that runs on top of the server. Initially, CIFS was a “chatty protocol” that was a bug and considered to have network issues. SMB has overcome it by using a pipeline mechanism. Thus, with the above-considered reasons, we use SMB over CIFS. SMB Authentication