The Get-NetFirewallRule cmdlet in PowerShell is a powerful tool for managing and querying the Windows Firewall rules on a system. It allows administrators to retrieve information about the firewall rules configured on a Windows machine, making it easier to audit and manage network security settings. In this article, we will explore how to use Get-NetFirewallRule with practical examples and scripts.

Examples:

1. Listing All Firewall Rules

   To list all the firewall rules on your system, you can use the following command:

   Get-NetFirewallRule

   This command will output a list of all the firewall rules, including their names, display names, and other properties.

2. Filtering Rules by Name

   If you want to find a specific rule by its name, you can use the -Name parameter. For example, to find a rule named "BlockHTTP", use:

   Get-NetFirewallRule -Name "BlockHTTP"

   This will return the details of the rule named "BlockHTTP".

3. Displaying Enabled Rules Only

   To list only the enabled firewall rules, you can filter the output using the Where-Object cmdlet:

   Get-NetFirewallRule | Where-Object { $_.Enabled -eq "True" }

   This will show only the rules that are currently enabled.

4. Exporting Firewall Rules to a File

   You can export the firewall rules to a CSV file for documentation or analysis purposes:

   Get-NetFirewallRule | Export-Csv -Path "C:\FirewallRules.csv" -NoTypeInformation

   This command will save all the firewall rules to a CSV file located at C:\FirewallRules.csv.

5. Finding Rules by Group

   To find all rules associated with a specific group, use the -Group parameter:

   Get-NetFirewallRule -Group "Remote Desktop"

   This will list all rules that are part of the "Remote Desktop" group.

6. Checking Rules for a Specific Profile

   You can filter rules based on the network profile (Domain, Private, Public) they apply to:

   Get-NetFirewallRule | Where-Object { $_.Profile -contains "Public" }

   This command will display rules that are applicable to the Public network profile.