A user cannot send e-mail messages by using Outlook Web Access server that is published by ISA Server 2006 when the delegation is set to NTLM

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Article ID: 974663 - View products that this article applies to.
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Consider the following scenario:
  • You configure Microsoft Internet Security and Acceleration (ISA) Server 2006 to publish a Microsoft Office Outlook Web Access (OWA) server.
  • You set the delegation of the publishing rule to NT LAN Manager (NTLM).
  • The publishing rule is configured to forward requests by using the client IP address.
  • A user logs on to OWA and then tries to send an e-mail message.
In this scenario, the send operation may fail, or th eoperation may be block for a long time.


Before ISA Server 2006 can forward the e-mail message in scenario, the session to the Exchange server is closed. Then, ISA Server 2006 tries to create a new session. The IP address and the port of the new session are identical to the IP address and the port of the closed session. Because of this behavior, the new session cannot be established before the Exchange server can clean up the old session.


To resolve this problem, follow these steps:
  1. Install the hotfix rollup package that is described in the following Microsoft Knowledge Base article:
    974665 Description of the ISA Server 2006 hotfix package: August 16, 2009
  2. Start Notepad.
  3. Copy and paste the following script into Notepad:
    Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"
    Const SE_VPS_NAME = "WebPublishingSleepBeforeReconnect"
    Const SE_VPS_VALUE = 10
    Sub 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
            ' Add the item
            Set VendorSet = VendorSets.Add( SE_VPS_GUID )
            WScript.Echo "New VendorSet added... " & VendorSet.Name
            WScript.Echo "Existing VendorSet found... value- " &  VendorSet.Value(SE_VPS_NAME)
        End If
        if VendorSet.Value(SE_VPS_NAME) <> SE_VPS_VALUE Then
            VendorSet.Value(SE_VPS_NAME) = SE_VPS_VALUE
            If Err.Number <> 0 Then
                VendorSets.Save false, true
                If Err.Number = 0 Then
                    WScript.Echo "Done with " & SE_VPS_NAME & ", saved!"
                End If
            End If
            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
        End If
    End Sub
  4. Save this Notepad file by using the .vbs file name extension. For example, save this file by using the following name:
  5. Double-click the WebPublishingSleepBeforeReconnect .vbs file to run the script.

Note This hotfix adds a short delay between the operation that closes the old session and the operation that creates the new session.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


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


Article ID: 974663 - Last Review: September 25, 2009 - Revision: 2.0
  • Microsoft Internet Security and Acceleration Server 2006 Service Pack 1, when used with:
    • Microsoft Internet Security and Acceleration Server 2006 Standard Edition
    • Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
kbexpertiseinter kbfix kbsurveynew kbqfe KB974663

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