What is NetBIOS 137?

What is NetBIOS 137?

NetBIOS is a protocol used for File and Print Sharing under all current versions of Windows. While this in itself is not a problem, the way that the protocol is implemented can be.

What uses NetBIOS?

NetBIOS stands for Network Basic Input Output System. It Allows computer communication over a LAN and allows them to share files and printers. NetBIOS names are used to identify network devices over TCP/IP (Windows).

Should I close port 137?

Port 137 is utilized by NetBIOS Name 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 137 in the Firewall.

Can I close port 135?

Disabling TCP port 135 will NOT affect Local DCOM/Raw RPC server component because they do not need network. Disabling TCP port 135 will only affect some client machine which directly use DCOM remote activation (i.e. VB CreateObject(“Excel.

What are the ports 137 and 138 of NetBIOS?

UDP port 137 (name services) UDP port 138 (datagram services) TCP port 139 (session services) NetBIOS over TCP/IP is specified by RFC 1001 and RFC 1002. The Netbt.sys driver is a kernel -mode component that supports the TDI interface.

Does Windows need its ports 137 and 138 open?

What is NetBIOS? Does Windows need its ports 137 and 138 open? – Super User What is NetBIOS? Does Windows need its ports 137 and 138 open? I never really understood NetBIOS. I didn’t understand the Wikipedia article about it. I searched YouTube but couldn’t find a video explaining what NetBIOS is. What does NetBIOS do?

What are the three services provided by NetBIOS?

NetBIOS provides three distinct services: 1 Name service (NetBIOS-NS) for name registration and resolution via port 137. 2 Datagram distribution service (NetBIOS-DGM) for connection less communication via port 138. 3 Session service (NetBIOS-SSN) for connection-oriented communication via port 139.

What are the ports for NetBIOS in Windows 2000?

I just wanted to add that for versions of Windows from Windows 2000 and onward, all of the legacy NetBIOS functionality from ports 137, 138 and 139 is by default handled by SMB (Server Message Block) over port 445.