Dictionary · Protocols and Ports
SMB
SMB — Server Message Block
File sharing · Intermediate
A protocol for shared files, printers, and related services, especially on Windows networks. Modern direct hosting uses TCP 445. Older setups also used NetBIOS ports.
When you open a shared folder on a company file server, this is usually the protocol doing the work. It should stay inside trusted networks or a protected tunnel, not be exposed casually to the Internet.
Example: A user maps a drive to a file server, and the client reaches that share on TCP 445.
Ports
- TCP 445 — Direct hosted file sharing
Common misconception
- Modern sharing does not require the old NetBIOS ports. Direct hosting uses TCP 445.