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

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Article ID: 976495 - View products that this article applies to.
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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 = true
    
    Sub 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 If
    
    End Sub
    
    Sub CheckError()
    
        If Err.Number <> 0 Then
            WScript.Echo "An error occurred: 0x" & Hex(Err.Number) & " " & Err.Description
            Err.Clear
        End If
    
    End Sub
    
    SetValue
  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: October 6, 2011 - Revision: 5.0
APPLIES TO
  • 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
Keywords: 
kbexpertiseinter kbsurveynew kbqfe KB976495

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