Windows firewall log file

To complete these procedures, you must be a member of the Domain Administrators group, or otherwise be delegated permissions to modify the GPOs. If you want to change this, clear the Not configured check box and type the path to the new location, or click Browse to select a file location. Important: The location you specify must have permissions assigned that permit the Windows Defender Firewall service to write to the log file. The default maximum file size for the log is 4, kilobytes KB.

If you want to change this, clear the Not configured check box, and type in the new size in KB, or use the up and down arrows to select a size. Contents Exit focus mode. In this article. The name of the Forefront TMG computer. This is the computer name assigned in Microsoft Windows. The date on which the logged event occurred. In the SQL Server Express format, both the date and the local time are included in the single logTime field, and the bits for both the date and time fields must be set.

The local time when the logged event occurred. The transport protocol used for the connection. The IP address of the requesting client and the source port used.

The network IP address and the reserved port number on the remote computer that provides service to the current connection. The port number is used by the client application initiating the request. The original IP address of the requesting client. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. To complete these procedures, you must be a member of the Domain Administrators group, or otherwise be delegated permissions to modify the GPOs.

In the details pane, in the Overview section, click Windows Firewall Properties. If you want to change this, clear the Not configured check box and type the path to the new location, or click Browse to select a file location. Fields — Displays a list of fields that are available for security log entries, if data is available.

The hours are referenced in hour format. As you notice, the log entry is indeed big and may have up to 17 pieces of information associated with each event. However, only the first eight pieces of information are important for general analysis.

With the details in your hand now you can analyze the information for malicious activity or debug application failures. If you suspect any malicious activity, then open the log file in Notepad and filter all the log entries with DROP in the action field and note whether the destination IP address ends with a number other than If you find many such entries, then take a note of the destination IP addresses of the packets.

Once you have finished troubleshooting the problem, you can disable the firewall logging. Troubleshooting network problems can be quite daunting at times and a recommended good practice when troubleshooting Windows Firewall is to enable the native logs. Although the Windows Firewall log file is not useful for analyzing the overall security of your network, it still remains a good practice if you want to monitor what is happening behind the scenes.

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