Error message when you open a .gz file that you downloaded through an ISA Server 2004 or ISA Server 2006 Web proxy server: "Invalid archive directory"

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SYMPTOMS
You download a file that has a .gz file name extension through a Microsoft Internet Security and Acceleration (ISA) 2004 or ISA Server 2006 Web proxy server. When you open the .gz file, you receive an error message that resembles the following:
Invalid archive directory.
Note This problem occurs if the response from the Web server contains a content-type header that has the value APPLICATION/G-ZIP.
CAUSE
This problem occurs because ISA Server 2004 and ISA Server 2006 decompress the .gz file before it is downloaded to the computer. This issue occurs if HTTP compression is enabled in ISA Server 2004.

Note By default, ISA Server 2004 and ISA Server 2006 do not send the Accept-Encoding HTTP header to the Web server. They send the Accept-Encoding HTTP header only when you enable HTTP compression.
RESOLUTION
Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure. However, they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements.

To resolve this problem, follow these steps:
  1. For ISA Server 2004: Install the hotfix that is described in the following Microsoft Knowledge Base article:
    951958 Description of the ISA Server 2004 hotfix package: April 21, 2008
    For ISA Server 2006: Download and install the latest service pack:
    954258 How to obtain the latest Internet Security and Acceleration (ISA) Server 2006 Service Pack
  2. For both versions of ISA Server, run the Visual Basic script to enable the update. To do this, follow these steps:
    1. Click Start, point to All Programs, point to Accessories, and then click Notepad.
    2. Paste the following code into the Notepad document.
      Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "EnableHotfix950150"Const SE_VPS_VALUE = trueSub SetValue()    ' Create the root obect.    Dim root  ' The FPCLib.FPC root object    Set root = CreateObject("FPC.Root")    'Declare the other objects needed.    Dim array       ' An FPCArray object    Dim VendorSets  ' An FPCVendorParametersSets collection    Dim VendorSet   ' An FPCVendorParametersSet object    ' Get references to the array object    ' and 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
    3. Save the Notepad file as Enable_9501050.vbs.
    4. Double-click the Enable_9501050.vbs file to run the script.

Hotfix installation information

Prerequisites

For ISA Server 2004, the computer must be running ISA Server 2004 Service Pack 3 (SP3). For more information about ISA Server 2004 SP3, click the following article number to view the article in the Microsoft Knowledge Base:
891024 How to obtain the latest ISA Server 2004 Service Pack
For ISA Server 2006, the latest service pack must be installed. For more information about how to obtain the latest service pack, 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

Restart requirement

ISA services are automatically restarted after you install the ISA Server 2004 hotfix or the ISA Server 2006 service pack.
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.
REFERENCES
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
Properties

Article ID: 950150 - Last Review: 01/16/2015 02:24:51 - 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 Enterprise Edition
  • Microsoft Internet Security and Acceleration Server 2006 Standard Edition
  • kbnosurvey kbarchive kbqfe kbprb kbexpertiseadvanced KB950150
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