To view the security log file
Open Network Connections
Click the connection for which Internet Connection Firewall is enabled, and then, under Network Tasks, click Change settings of this connection.
On the Advanced tab, click Settings
On the Security Logging tab, under Log file options, under Name, click Browse.
Scroll to pfirewall.log, right-click pfirewall.log, and then click Open.
Double-click the log file to open it, and view the contents.
To open Network Connections, click Start, click Control Panel, click Network and Internet Connections, and then click Network Connections.
The default name for the firewall log is pfirewall.log and the location is in the Windows folder.
If the maximum allowable size for pfirewall.log is exceeded, the information that the log file contains is written to a new file and saved as pfirewall.log.1. The new information is saved in pfirewall.log.
Internet Connection Sharing, Internet Connection Firewall, Discovery and Control, and Network Bridge are not available on Windows XP 64-Bit Edition.
Internet Connection Firewall overview
Enable or disable Internet Connection Firewall
Enable security logging options