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Posted 24 Jan 2007


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Programmatically disable/enable Windows firewall

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4.34/5 (15 votes)
24 Jan 2007CPOL
This article teaches you how to disable and enable your Windows firewall programmatically.


This article teaches you how to disable and enable your Windows firewall programmatically.


  • Create a new Windows Application project.
  • Click on Project->Add Reference and add the following files:
    • Click Browse tab -> Add C:\windows\system32\Hnetcfg.dll.
    • Click COM tab -> Add NetFwTypeLib.


Currently, this only works with Windows XP SP2. If you need support for this in Vista, add Wfapi.dll.


Imports System
Imports NetFwTypeLib

' Provides access to the firewall settings for a computer.
Public Function GetFwMgr() As NetFwTypeLib.INetFwMgr
    Dim oINetFwMgr As NetFwTypeLib.INetFwMgr
    Dim NetFwMgrObject As Object
    Dim NetFwMgrType As Type

    ' Use the COM CLSID to get the associated .NET System.Type
    NetFwMgrType = Type.GetTypeFromCLSID( _
     New Guid("{304CE942-6E39-40D8-943A-B913C40C9CD4}"))

    ' Create an instance of the object
    NetFwMgrObject = Activator.CreateInstance(NetFwMgrType)
    oINetFwMgr = NetFwMgrObject

    Return oINetFwMgr
End Function

' Provides access to the firewall settings profile.
Public Function GetProfile() As NetFwTypeLib.INetFwProfile

    Dim oINetPolicy As NetFwTypeLib.INetFwPolicy
    Dim oINetFwMgr As NetFwTypeLib.INetFwMgr

    oINetFwMgr = GetFwMgr()

    oINetPolicy = oINetFwMgr.LocalPolicy
    Return oINetPolicy.CurrentProfile

End Function

' Enable windows firewall.
Public Sub ActivateFirewall()
    Dim fwProfile As NetFwTypeLib.INetFwProfile
    fwProfile = GetProfile()
    fwProfile.FirewallEnabled = True
End Sub

' Disable windows firewall.
Public Sub DisableFirewall()
    Dim fwProfile As NetFwTypeLib.INetFwProfile
    fwProfile = GetProfile()
    fwProfile.FirewallEnabled = False
End Sub

' Firewall state || False = Disabled - True = Enabled.
Public Function FirewallEnabled() As Boolean
    Dim fwProfile As NetFwTypeLib.INetFwProfile
    fwProfile = GetProfile()
    Return fwProfile.FirewallEnabled
End Function

' Enable firewall on Form_Load.
Private Sub Form1_Load(ByVal sender As System.Object, _
            ByVal e As System.EventArgs) Handles MyBase.Load
    If FirewallEnabled() = False Then
    End If
    MessageBox.Show("Firewall enabled: " & FirewallEnabled())
End Sub


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralMy vote of 5 Pin
JalalAldeen26-Apr-13 21:43
MemberJalalAldeen26-Apr-13 21:43 
Questionfirewall settings Pin
Kanimozhikannanthasan2-Mar-11 0:59
MemberKanimozhikannanthasan2-Mar-11 0:59 
GeneralMy vote of 5 Pin
theMadCoder10-Dec-10 8:17
MembertheMadCoder10-Dec-10 8:17 
NewsHere it is in C# Pin
theMadCoder10-Dec-10 4:25
MembertheMadCoder10-Dec-10 4:25 
Generalfirewall setting Pin
Bhim Prakash Singh30-Oct-09 23:55
MemberBhim Prakash Singh30-Oct-09 23:55 
Generalgood article Pin
Donsw25-Oct-09 16:12
MemberDonsw25-Oct-09 16:12 
Good article but this only shows xp which is the easiest. how about an update for vista and now win 7

My Recent Article : CDC - Change Data Capture

GeneralEnable Disable Widows Firewall for Remote System. Pin
ganesh1984051513-Nov-08 0:09
Memberganesh1984051513-Nov-08 0:09 
Generalerror in code Pin
oudfliurquidqw058fh16-Sep-08 23:34
Memberoudfliurquidqw058fh16-Sep-08 23:34 
GeneralStraight to the point article Pin
nnm2-Sep-08 13:55
Membernnm2-Sep-08 13:55 
QuestionWhy it don't work?? Pin
us017396-Feb-07 21:45
Memberus017396-Feb-07 21:45 
GeneralAnother article on the same topic ... Pin
Tony Selke29-Jan-07 9:04
MemberTony Selke29-Jan-07 9:04 
Generalgood work! Pin
Tenschman27-Jan-07 3:04
MemberTenschman27-Jan-07 3:04 

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