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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

Article ID: 976495 - View products that this article applies to.

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).

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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.

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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

(http://support.microsoft.com/kb/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:

Install the hotfix rollup package that is described in the following Microsoft Knowledge Base (KB) article:
977530
(http://support.microsoft.com/kb/977530/ )
Description of the ISA Server 2006 hotfix package: December 8, 2009

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

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
Double-click the .vbs file to run it.

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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.

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