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Adding an Application Rule to the Windows Firewall with PowerShell

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The script below was adapted from the vbscript code at:

http://msdn.microsoft.com/en-us/library/aa364695(v=VS.85).aspx

 

#--********************************************************************/
#  This PowerShell script includes sample code for adding an Application
#  rule using the Microsoft Windows Firewall APIs.
#--********************************************************************/

set-psdebug -strict

$CurrentProfile = $null

# Protocol
set-variable -name NET_FW_IP_PROTOCOL_TCP -value 6 -option constant

# Action
set-variable -name NET_FW_ACTION_ALLOW -value 1 -option constant

# Create the FwPolicy2 object.
$fwPolicy2 = $null
$fwPolicy2 = new-object -comobject HNetCfg.FwPolicy2

# Get the Rules object
$RulesObject = $null
$RulesObject = $fwPolicy2.Rules

$CurrentProfiles = $fwPolicy2.CurrentProfileTypes

# Create a Rule Object.
$NewRule = $null
$NewRule = new-object -comobject HNetCfg.FWRule

$NewRule.Name = "My Application Name"
$NewRule.Description = "Allow my application network traffic"
$NewRule.Applicationname = "%systemDrive%\Program Files\MyApplication.exe"
$NewRule.Protocol = $NET_FW_IP_PROTOCOL_TCP
$NewRule.LocalPorts = 4000
$NewRule.Enabled = $True
$NewRule.Grouping = "@firewallapi.dll,-23255"
$NewRule.Profiles = $CurrentProfiles
$NewRule.Action = $NET_FW_ACTION_ALLOW

# Add a new rule
$RulesObject.Add($NewRule)

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