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Event ID: 5157 Source: Microsoft-Windows-Security-Auditing

Description
The Windows Filtering Platform has blocked a connection.

Application Information:
Process ID: 4
Application Name: System

Network Information:
Direction: Inbound
Source Address: <LAN Broadcast Address>
Source Port: 138
Destination Address: <Client IP Address>
Destination Port: 138
Protocol: 17

Filter Information:
Filter Run-Time ID: 0
Layer Name: Receive/Accept
Layer Run-Time ID: 44
Comments
 
The Windows Filtering Platform (WFP) provides auditing of firewall events and this message is an example of the firewall blocking an application that was trying to connect over the network with a remote host. The event description includes details about the name of the application, what network protocol (TCP/IP port) it tried to use, the direction of the traffic (inbound vs. outbound). This information can be used by the administrator to determine if this type of application should stay blocked or exception have to be configured within the firewall to allow it.

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