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The "401 Authentication Required" response that is sent by a Web site is dropped when you use ISA Server 2004 or ISA Server 2006 as a Web proxy

SYMPTOMS
Consider the following scenario:
  • You use Microsoft Internet Security and Acceleration (ISA) Server 2004 or ISA Server 2006 as a Web proxy to access a Web site.
  • You perform a POST operation on the Web site.
  • The Web site sends a "401 Authentication Required" response to the client.
However, ISA Server drops the "401 Authentication Required" response instead of forwarding the response to the client. This problem may cause the Web access attempt to fail. For example, when you try to upload a large file to the Web site, the upload operation may time out.
RESOLUTION
To resolve this problem, follow these steps:
  1. If you are running ISA Server 2004, apply the hotfix package that is described in the following Microsoft Knowledge Base article:
    940709 Description of the ISA Server 2004 hotfix package: July 25, 2007

    If you are running ISA Server 2006, apply the last ISA Server service pack. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
    954258 How to obtain the latest Internet Security and Acceleration (ISA) Server 2006 service pack
  2. Start Notepad.
  3. Copy the following code, and then paste it into Notepad.
    Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "AllowPrematureServerResponse"Const SE_VPS_VALUE = trueSub SetValue()    ' Create the root object.    Dim root  ' The FPCLib.FPC root object    Set root = CreateObject("FPC.Root")    'Declare the other objects that are needed.    Dim array       ' An FPCArray object    Dim VendorSets  ' An FPCVendorParametersSets collection    Dim VendorSet   ' An FPCVendorParametersSet object    ' Get references to the array object    ' and to the network rules collection.    Set array = root.GetContainingArray    Set VendorSets = array.VendorParametersSets    On Error Resume Next    Set VendorSet = VendorSets.Item( SE_VPS_GUID )    If Err.Number <> 0 Then        Err.Clear        ' Add the item.        Set VendorSet = VendorSets.Add( SE_VPS_GUID )        CheckError        WScript.Echo "New VendorSet added... " & VendorSet.Name    Else        WScript.Echo "Existing VendorSet found... value- " &  VendorSet.Value(SE_VPS_NAME)    End If    if VendorSet.Value(SE_VPS_NAME) <> SE_VPS_VALUE Then        Err.Clear        VendorSet.Value(SE_VPS_NAME) = SE_VPS_VALUE        If Err.Number <> 0 Then            CheckError        Else            VendorSets.Save false, true            CheckError            If Err.Number = 0 Then                WScript.Echo "Done with " & SE_VPS_NAME & ", saved!"            End If        End If    Else        WScript.Echo "Done with " & SE_VPS_NAME & ", no change!"    End IfEnd SubSub CheckError()    If Err.Number <> 0 Then        WScript.Echo "An error occurred: 0x" & Hex(Err.Number) & " " & Err.Description        Err.Clear    End IfEnd SubSetValue
  4. Save the file as a Microsoft Visual Basic script file by using the .vbs file name extension. For example, use the following name to save the file:
    AllowPrematureServerResponse.vbs
  5. Start a command prompt, change to the location at which you saved the AllowPrematureServerResponse.vbs file, and then run the following command:
    cscript AllowPrematureServerResponse.vbs
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
For more information about how to install ISA Server hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base:
885957 How to install ISA Server hotfixes and updates
silently drops target
Properties

Article ID: 940708 - Last Review: 10/24/2008 16:54:08 - Revision: 2.0

Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition, Microsoft Internet Security and Acceleration Server 2004 Standard Edition, Microsoft Internet Security and Acceleration Server 2006 Standard Edition, Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition

  • kbexpertiseinter kbqfe KB940708
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