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FIX: ISA Server 2006 or Forefront TMG 2010 does not detect a TCP reset response when you enable HTTP compression

SYMPTOMS
Consider the following scenario:
  • You enable HTTP compression in Microsoft Internet Security and Acceleration (ISA) Server 2006 or in Microsoft Forefront Threat Management Gateway (TMG) 2010.
  • On a client, you use ISA Server 2006 or Forefront TMG 2010 as a Web proxy to connect to a Web server. However, the Web server takes a long time to respond to HTTP requests from the client.

    Note When the Web server sends data to ISA Server 2006 or to Forefront TMG 2010, ISA Server 2006 or Forefront TMG 2010 accumulates data. ISA Server 2006 or Forefront TMG 2010 does not send any data to the client until the Web server finishes the HTTP request.
  • You close the Web browser before the Web server is finished responding.
  • The client sends a TCP reset response to ISA Server 2006 or to Forefront TMG 2010 on a TCP session that was opened.
  • You try to access the Web site again, and the client or an intermediate proxy server uses the same source port from the previous TCP session that just obtains the TCP reset response.
In this scenario, ISA Server 2006 or Forefront TMG 2010 does not detect the TCP reset response until Web server sends a complete HTTP response, and ISA Server 2006 or Forefront TMG 2010 rejects the new client connection by using the same client port. Therefore, you cannot access the Web site by using the same source port.

Note The supported fix for Forefront TMG 2010 is included in Forefront TMG 2010 Service Pack 1 (SP1).
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 issue, follow these steps:
  1. Install the hotfix rollup package that is described in the following Microsoft Knowledge Base (KB) article:
    980067 Description of the ISA Server 2006 hotfix package: February 22, 2010
  2. Copy and paste the following script into Notepad:
    Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "AllowPrematureClientTermination"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 file as a Microsoft Visual Basic script file by giving the file a .vbs file name extension. For example, save the file under the following name:
    EnableKB980066.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: 980066 - Last Review: 10/06/2011 14:28:00 - Revision: 3.0

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

  • kbexpertiseinter kbfix kbsurveynew kbqfe KB980066
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