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Windows XP SP2 Firewall Controller

, 10 Jul 2006
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How to control a base firewall included in Windows XP SP2 using COM.

Sample Image - WinXPSP2Firewall.jpg


Windows XP SP2 basically has a small firewall. It's very easy to control, but sometimes it bothers you. When your application tries to connect to the internet, Windows shows a warning message-box, and this makes users feel your application is an Ad-Ware.

To prevent such things, I suggest you add your program to a Firewall Collection List. (This list contains the allowed programs.)

This wrapper class is very easy, simple, and useful. You don't need to see this 'Security Alert' message box any more:

Sample Image - Windows Firewall Security Alert Message Box

Implementation - C++

It's very easy. Just connect to the Windows XP Firewall as a COM, and do what you want.

FW_ERROR_CODE WinXPSP2FireWall::Initialize()
 INetFwMgr* fwMgr = NULL;
 INetFwPolicy* fwPolicy = NULL;

  if( m_pFireWallProfile )
  /* Create an instance of the firewall settings manager. */
  hr = CoCreateInstance( __uuidof(NetFwMgr), NULL, 
         CLSCTX_INPROC_SERVER, __uuidof( INetFwMgr), (void**)&fwMgr );
  if( FAILED( hr ))
  /* Retrieve the local firewall policy. */
  hr = fwMgr->get_LocalPolicy( &fwPolicy );
  if( FAILED( hr ))
  /* Retrieve the firewall profile currently in effect */

  hr = fwPolicy->get_CurrentProfile( &m_pFireWallProfile );
  if( FAILED( hr ))
   throw FW_ERR_PROFILE;
 catch( FW_ERROR_CODE nError)
  ret = nError;
 if( fwPolicy )
 if( fwMgr )
 return ret;

How to Use in C++

It's very easy to use. Just make an instance, and call Initialize(). Ensure that you call the Initialize() function after calling CoInitialize(). You can call Uninitialize() by yourself, but the destructor calls the function too. Also, you should know that you must let Uninitialize() be called before CoUninitialize() is called.

 WinXPSP2FireWall fw;
 wchar_t szApplication[MAX_PATH];
 GetCurrentDirectoryW( MAX_PATH, szApplication );

#ifdef _DEBUG

  wcscat(szApplication, L"file://Debug//WindowsFirewall.exe");
 wcscat( szApplication, L"file://Release//WindowsFirewall.exe");

 fw.AddApplication( szApplication, L"FireWallTest");
 fw.RemoveApplication( szApplication );
 fw.AddPort( 4321, NET_FW_IP_PROTOCOL_TCP, L"FireWallPortTest" );
 fw.RemovePort( 4321, NET_FW_IP_PROTOCOL_TCP );

How to Use in C#

Usage in C# is very similar to that in C++. But it doesn't require APIs for COM interfaces, this makes it easier to implement this in C# than C++. Allocate an instance of the WinXPSP2FireWall, and call Initialize() first. And then use the methods you want. That's all! Smile | :)

Moah.WinXPSP2FireWall fw = new Moah.WinXPSP2FireWall();

string strApplication = System.Environment.CurrentDirectory + 
fw.AddApplication(strApplication, "FireWallTest");


Acknowledgment for C++

You need four files to compile this project: netfw.h, netfw.idl, icftypes.h, and icftypes.idl. You can get those files from the Windows XP SP2 PSDK. Or I have included the files in the downloads. You can just use them, instead of downloading and installing the SDK.

Acknowledgment for C#

If you have errors with NetFwTypeLib, add a reference to hnetcfg.dll. You can do that through "Project -> Add Reference... -> Browse" in Visual Studio, and the DLL file is usually located in "C:\Windows\System32\hnetcfg.dll".


  • 6, Jul. 2005
    • First release.
  • 10, Jul. 2006
    • Added a C# version of the Windows XP SP2 Firewall Controller.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Web Developer
Korea (Republic Of) Korea (Republic Of)
Youngjin Kim lives in South Korea. I'm interested in every part of Computer Science, cause it has not been long time since graduate a University.
But now I'm working and researching on Pattern Recognition. Using that trying to recognize a Handwriting Prints. Korean and Chinese are my interesting Research Part.

Comments and Discussions

QuestionMultiple profiles [modified] Pinmembertianjin2241-Nov-13 17:15 
QuestionLicense PinmemberMember 896106529-May-12 0:27 
Questionhow to run this source code PinmemberMember 39583127-Sep-08 0:24 
QuestionHow to add Windws Service Exception??? Pinmembererickbp212-Sep-08 10:20 
Generalbug under Vista Pinmembernoelhx27-Mar-07 19:55 
QuestionXP firewall gets automatically DISABLED when using this?? PinmemberOrion Richardson228-Dec-06 5:28 
AnswerRe: XP firewall gets automatically DISABLED when using this?? Pinmembermoah28-Dec-06 7:02 
AnswerRe: XP firewall gets automatically DISABLED when using this?? PinmemberOrion Richardson27-Feb-07 9:49 
GeneralRe: XP firewall gets automatically DISABLED when using this?? Pinmemberchinnu_114-Feb-07 0:19 
GeneralRe: XP firewall gets automatically DISABLED when using this?? Pinmemberel delo15-May-07 13:52 
QuestionDoes this work on Vista? Pinmemberthomastom19-Sep-06 12:00 
AnswerRe: Does this work on Vista? Pinmemberthomastom19-Sep-06 15:02 
GeneralRe: Does this work on Vista? Pinmembermoah20-Sep-06 6:45 
AnswerRe: Does this work on Vista? PinmemberEd Dixon28-Dec-06 13:50 
GeneralDon't listen to the complainers PinmemberTomM11-Aug-06 12:40 
GeneralRe: Don't listen to the complainers Pinmembermoah12-Aug-06 3:37 
Questionwhat if there is no SP? PinmemberMario M.21-Jul-06 14:35 
AnswerRe: what if there is no SP? Pinmembermoah23-Jul-06 17:05 
GeneralFirewall on Windows 2000 and XP SP1 PinmemberFornazin19-Jul-06 5:46 
GeneralRe: Firewall on Windows 2000 and XP SP1 Pinmembermoah19-Jul-06 21:22 
GeneralRe: Firewall on Windows 2000 and XP SP1 Pinmemberpadma81015-Nov-06 0:30 
GeneralRe: Firewall on Windows 2000 and XP SP1 Pinmembermoah15-Nov-06 1:49 
GeneralAbout the C# version Pinmemberhdkrus28-Jun-06 7:07 
GeneralRe: About the C# version Pinmembermoah29-Jun-06 16:22 
GeneralAbout the C# version Pinmemberhdkrus11-Jul-06 7:03 

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