FIX: Winhttp.dll Causes a Memory Leak When Windows Integrated Authentication Fails

Microsoft Windows 2000 Operating Systems

 

    Date         Time   Version            Size    File name
   --------------------------------------------------------------
   27-Aug-2003  05:22  5.1.2600.1264     310,784  Winhttp.dll      
  
 
				

Microsoft Windows XP Operating Systems

 

      Date         Time   Version            Size    File name
   --------------------------------------------------------------
   21-Aug-2003  05:46  5.1.2600.1264     945,152  Winhttp.dll      
  
  
 
				

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Steps to Reproduce the Behavior

1. Start Microsoft Visual Studio .NET.
2. On the File menu, point to New, and then click Project.
3. Click Visual Basic Projects or Visual C# Projects under Project Types, and then click ASP.NET Web Service under Templates.
4. Name the project SampleWebService.
5. In the Service1.asmx file, uncomment the HelloWorld Web service method.
6. On the Build menu, click Build Solution.
7. Click Start, and then click Run.
8. Type inetmgr in the Open box, and then click OK.
9. In the Internet Information Services window, expand Default Web Site.
10. Right-click SampleWebService, and then click Properties.
11. In the SampleWebService Properties dialog box, click the Directory Security tab.
12. Under Anonymous access and authentication control, click Edit.
13. In the Authentication Methods dialog box, click to select the Integrated Windows authentication check box.
    
    Note Make sure that all the other check boxes in the Authentication Methods dialog box are cleared.
14. Click OK two times to close the SampleWebService Properties dialog box.
15. Close the Internet Information Services window.
16. Start Microsoft Visual Basic 6.0.
17. Create a Standard EXE project. By default, Form1 is created.
18. Add a CommandButton control and a ProgressBar control to Form1. If the toolbox does not contain the ProgressBar control, follow these steps:
    1. On the Project menu, click Components.
    2. Click to select Microsoft Windows Common Controls 6.0.
       
       Note If the Controls tab of the Components dialog box does not contain Microsoft Windows Common Controls 6.0, click Browse, click MSCOMCTL.OCX, and then click Open.
    3. Click OK to close the Components dialog box.
19. In the click event of the Command1 control, paste the following code:

    Dim objSoapClient As Object
    Dim wsdl As String
    Dim MySoapResponse As String
    Dim i As Long
    
    ' The wsdl variable contains the physical path of the wsdl in the client.
    wsdl = "C:\SoapClient\SoapTestSrv.wsdl"
    Set objSoapClient = CreateObject("Mssoap.SoapClient30")
    objSoapClient.MSSoapInit wsdl
    
    ' The value of AuthUser/AuthPassword must be incorrect for a memory leak to occur.
    objSoapClient.ConnectorProperty("AuthUser") = "TestUserid"
    objSoapClient.ConnectorProperty("AuthPassword") = "TestPassword"
    objSoapClient.ConnectorProperty("WinHTTPAuthScheme") = 2
    
    ' Replace ServerName with the name of the server where the Web service Service1.asmx is hosted.
    objSoapClient.ConnectorProperty("EndPointURL") = "http://ServerName/SampleWebService/Service1.asmx"
    
    For i = 1 To 500000
        On Error Resume Next
        On Error GoTo Error
        MySoapResponse = objSoapClient.HelloWorld
    
        'If you run this code, you will notice a memory leak.
        If (i Mod 500000) = 0 Then
            ProgressBar1.Value = ProgressBar1.Value + 1
        End If
    
    Error:
        MsgBox (Err.Description)
    Next
    
    Set objSoapClient = Nothing

20. On the Run menu, click Start. Form1 is displayed.
21. On Form1, click Command1.

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