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Event ID: 850 Source: Security

Source
Description
A port was listed as an exception when the Windows Firewall started.

Policy origin: Local Policy
Profile used: Standard
Interface: All interfaces
Name: <application name>
Port number: <port number>
Protocol: <protocol type>
State: Enabled
Scope: Local subnet only
Comments
 
This is the result of a security feature introduced by Windows XP Service Pack 2. The operating system will attempt to validate any application that is using a TCP/IP port. Reported applications:
- NetBIOS Session Service - protocol TCP/139 - used by NetBIOS and enabled by default
- NetBIOS Datagram Service - protocol UDP/138 - used by NetBIOS and enabled by default
- NetBIOS Name Service - protocol UDP/137 - used by NetBIOS and enabled by default
- SSDP Component of UPnP Framework - protocol UDP/1900 - enabled by default
- UPnP Framework over TCP - protocol TCP/2869 - enabled by default
- Remote Desktop - protocol TCP/3389 - enabled by default
- SMB over TCP - protocol TCP/445 - enabled by default

See the link to the EventID.Net TCP/IP ports for more details about a specific protocol.

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