What is SMB port 139 2024?
I'll answer
Earn 20 gold coins for an accepted answer.20
Earn 20 gold coins for an accepted answer.
40more
40more
Julian Martin
Works at the International Fund for Agricultural Development, Lives in Rome, Italy.
Self-Introduction:
Greetings! As an expert in network security, I'm here to provide a detailed explanation of SMB port 139.
SMB Port 139: An Overview
Server Message Block (SMB) is a network protocol used for file and printer sharing in Windows environments. It operates on Transmission Control Protocol (TCP) port 139 and is the primary port for NetBIOS over TCP/IP (NetBT).
SMB port 139 allows computers on a network to communicate with each other and access shared resources. When a computer requests to connect to a shared resource, such as a file or printer, it sends a message to port 139 on the server hosting the resource. The server then responds with the appropriate data or permissions.
Security Considerations:
While SMB is a widely used protocol, it is also vulnerable to various attacks. One of the most common is the SMB relay attack, which exploits vulnerabilities in SMB to gain unauthorized access to a network. To mitigate these risks, it's crucial to:
- Keep your **operating system and SMB software up to date** with the latest security patches.
- Disable SMBv1, an outdated and insecure version of the protocol.
- Restrict access to port 139 only to authorized users and devices.
- Use a firewall to block unauthorized access to port 139.
- Consider implementing network segmentation to isolate critical systems from potential threats.
Additional Information:
- SMB port 139 is used for both client-to-server and server-to-server communication.
- It is the default port for SMB**, but it can be changed for security reasons.
- SMB port 139 is often used in conjunction with other ports, such as **TCP port 445 (SMB over TCP/IP) and UDP port 137 (NetBIOS name service).
Greetings! As an expert in network security, I'm here to provide a detailed explanation of SMB port 139.
SMB Port 139: An Overview
Server Message Block (SMB) is a network protocol used for file and printer sharing in Windows environments. It operates on Transmission Control Protocol (TCP) port 139 and is the primary port for NetBIOS over TCP/IP (NetBT).
SMB port 139 allows computers on a network to communicate with each other and access shared resources. When a computer requests to connect to a shared resource, such as a file or printer, it sends a message to port 139 on the server hosting the resource. The server then responds with the appropriate data or permissions.
Security Considerations:
While SMB is a widely used protocol, it is also vulnerable to various attacks. One of the most common is the SMB relay attack, which exploits vulnerabilities in SMB to gain unauthorized access to a network. To mitigate these risks, it's crucial to:
- Keep your **operating system and SMB software up to date** with the latest security patches.
- Disable SMBv1, an outdated and insecure version of the protocol.
- Restrict access to port 139 only to authorized users and devices.
- Use a firewall to block unauthorized access to port 139.
- Consider implementing network segmentation to isolate critical systems from potential threats.
Additional Information:
- SMB port 139 is used for both client-to-server and server-to-server communication.
- It is the default port for SMB**, but it can be changed for security reasons.
- SMB port 139 is often used in conjunction with other ports, such as **TCP port 445 (SMB over TCP/IP) and UDP port 137 (NetBIOS name service).
2024-06-13 15:30:51
reply(1)
Helpful(1122)
Helpful
Helpful(2)
Works at the International Committee of the Red Cross, Lives in Geneva, Switzerland.
SMB / CIFS / SMB1. ... Since Windows 2000, SMB runs, by default, with a thin layer, similar to the Session Message packet of NBT's Session Service, on top of TCP, using TCP port 445 rather than TCP port 139��a feature known as "direct host SMB".
2023-04-08 19:49:40
Felix Martin
QuesHub.com delivers expert answers and knowledge to you.
SMB / CIFS / SMB1. ... Since Windows 2000, SMB runs, by default, with a thin layer, similar to the Session Message packet of NBT's Session Service, on top of TCP, using TCP port 445 rather than TCP port 139��a feature known as "direct host SMB".
