What is port 139 used for?
Understand the Problem
The question is asking about the usage of port 139, which is commonly associated with network communications, specifically file and printer sharing over a network. This port is primarily used by the Server Message Block (SMB) protocol in Windows networking environments.
Answer
SMB file and printer sharing over NetBIOS
Port 139 is primarily used by the Server Message Block (SMB) protocol for file and printer sharing over NetBIOS in Windows networks.
Answer for screen readers
Port 139 is primarily used by the Server Message Block (SMB) protocol for file and printer sharing over NetBIOS in Windows networks.
More Information
Port 139 is notable for its role in older networking implementations and is considered a significant security vulnerability when exposed to the internet. It was a key part of earlier Windows networking before SMB over TCP (port 445) became more common.
Tips
Assuming port 139 is always safe can lead to security breaches. Ensure proper safeguards and consider disabling it if not needed.
Sources
- What is Port 139? - CBT Nuggets - cbtnuggets.com
- What is an SMB Port? A Detailed Description of Ports 445 + 139 - upguard.com
- What is an SMB Port + Ports 445 and 139 Explained - varonis.com
