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"Sign in as a Different User" component does not work on a SharePoint website that is published by Forefront TMG 2010

SYMPTOMS
Consider the following scenario:
  • You publish a Microsoft SharePoint website by using a publishing rule in Microsoft Forefront Threat Management Gateway (TMG) 2010.
  • The publishing rule uses Kerberos Constrained Delegation (KCD).
  • The web listener for the website uses Windows authentication or forms-based authentication (FBA).
  • A user logs on to the SharePoint website.

In this scenario, the Sign in as a Different User component does not work on the SharePoint website.
CAUSE
This issue occurs because of a code bug.
RESOLUTION

Update information

The software update that is required to resolve this issue is described in the following Microsoft Knowledge Base (KB) article:
2498770 Software Update 1 rollup 3 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1

To resolve this issue, apply this update, and then run the following script on any array member.

Note This script enables SharePoint Server (SPS) publishing that uses FBA and authentication delegation that uses KCD. If you want to enable SPS publishing that uses integrated authentication, and if you want authentication delegation to use KCD, run this script. Then, run the additional script that immediately follows:
Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "EnableSharepointSignIn"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   
If you want to enable SPS publishing that uses integrated authentication, and if you want authentication delegation to use KCD, also run the following script:
Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "UseOnlyNTLMForWindowsAuth"Const SE_VPS_VALUE = 1 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
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
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: 2445386 - Last Review: 03/25/2011 03:19:00 - Revision: 2.0

Microsoft Forefront Threat Management Gateway 2010 Enterprise, Microsoft Forefront Threat Management Gateway 2010 Service Pack 1, Microsoft Forefront Threat Management Gateway 2010 Standard

  • kbqfe kbfix kbsurveynew kbexpertiseinter KB2445386
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