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FIX: You cannot download a message attachment from the OWA server if the OWA server is published by using ISA Server 2006 or Forefront TMG 2010

SYMPTOMS
Consider the following scenario:
  • You publish a Microsoft Office Outlook Web Access (OWA) server for Microsoft Exchange Server 2007 by using Microsoft Internet Security and Acceleration (ISA) Server 2006 or Microsoft Forefront Threat Management Gateway (TMG) 2010.
  • You set the publishing rule to use the NT LAN Manager (NTLM) delegation.
  • You log on to OWA, you open a message in a separate window, and then you open an attachment of the message.
In this scenario, the attachment download fails.

Note The supported fix for Forefront TMG 2010 is included in Forefront TMG 2010 Service Pack 1 (SP1).
CAUSE
This issue occurs because ISA Server 2006 or Forefront TMG 2010 sometimes adds a "Pragma: no-cache" header to a response from Exchange Server 2007. When this happens, Windows Internet Explorer cannot cache the attachment. Therefore, Internet Explorer cannot download the attachment.
RESOLUTION

Service pack information

This problem is fixed in Forefront TMG 2010 Service Pack 1.

For more information about how to obtain Forefront TMG 2010 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:
981324 List of problems that are fixed in Forefront Threat Management Gateway 2010 Service Pack 1

Hotfix rollup information


Hotfix installation information

To resolve this problem, follow these steps:
  1. Install the hotfix rollup package that is described in the following Microsoft Knowledge Base (KB) article:
    977530 Description of the ISA Server 2006 hotfix package: December 8, 2009
  2. Start Notepad, and then copy the following script into a Notepad file.
    Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "EnableHotfix976495"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
  3. Save the file as a Microsoft Visual Basic script file by using the .vbs file name extension. For example, assume that you save the file by using the following name:
    EnableKB976495.vbs
  4. Double-click the .vbs file to run it.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Forefront TMG 2010 Service Pack 1.
REFERENCES
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Properties

Article ID: 976495 - Last Review: 10/06/2011 14:26:00 - Revision: 5.0

Microsoft Internet Security and Acceleration Server 2006 Service Pack 1, Microsoft Internet Security and Acceleration Server 2006 Standard Edition, Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition, Microsoft Forefront Threat Management Gateway 2010 Enterprise, Microsoft Forefront Threat Management Gateway 2010 Standard

  • kbexpertiseinter kbsurveynew kbqfe KB976495
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