What is NetBIOS-SSN used for?
What is NetBIOS-SSN used for?
| Name: | netbios-ssn |
|---|---|
| Purpose: | NETBIOS Session Service |
| Description: | TCP NetBIOS connections are made over this port, usually with Windows machines but also with any other system running Samba (SMB). These TCP connections form “NetBIOS sessions” to support connection oriented file sharing activities. |
| Related Ports: | 137, 138, 445 |
What is 139 TCP NetBIOS-SSN?
Port 139 is utilized by NetBIOS Session service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet. Therefore it is advisable to block port 139 in the Firewall.
What is NetBIOS-SSN SMB?
NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack. Using TCP allows SMB to work over the internet.
What port is NetBIOS-SSN?
139 tcp
Service Name and Transport Protocol Port Number Registry
| Service Name | Port Number | Transport Protocol |
|---|---|---|
| netbios-ssn | 139 | tcp |
| netbios-ssn | 139 | udp |
| imap | 143 | tcp |
| 143 | udp |
Is port 139 still needed?
If you are on Windows-based network that is running NetBios, it is perfectly normal to have port 139 open in order to facilitate that protocol. If you are not on a network using NetBios, there is no reason to have that port open.
Is port 139 still used?
Port 139 is used by SMB dialects that communicate over NetBIOS. It’s a transport layer protocol designed to use in Windows operating systems over a network. Port 445 is used by newer versions of SMB (after Windows 2000) on top of a TCP stack, allowing SMB to communicate over the Internet.
Should I allow NetBIOS?
There are many security concerns with NetBIOS; and disabling its support on your network and devices is strongly recommended. Disabling the use and support of NetBIOS can help to mitigate an attacker’s ability to: poison and spoof responses, obtain a user’s hashed credentials, inspect web traffic, etc.
Is NetBIOS a Samba?
To access it, use Windows Explorer to browse to the Samba server (use either its name or IP address). There is another networking protocol that has long been associated with Windows networking and, therefore, an integral part of the Samba suite: NetBIOS.