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Error message when a user accesses a SharePoint Web site that is published in ISA Server 2006 or in Windows Essential Business Server 2008: "HTTP 401 Unauthorized"

SYMPTOMS
When a user accesses a SharePoint Web site that is published in Microsoft Internet Security and Acceleration (ISA) Server 2006, ISA Server 2006 SP1 or in Windows Essential Business Server 2008, the user may receive one of the following error messages:

Error message 1
HTTP 401 Unauthorized
Error message 2
HTTP 500 The server denied the specified Uniform Resource Locator (URL). Contact the server administrator.
This problem occurs when the following conditions are true:
  • In the Web listener that the SharePoint Web publishing rule uses, HTML Form Authentication is configured.
  • The Web client sends a POST request to the SharePoint Web site.
  • The URL of the POST request contains extended characters. For example, the URL contains é, à, or è.
CAUSE
This problem occurs because ISA Server or Windows Essential Business Server 2008 cannot parse a URL that contains extended characters. In this case, ISA Server or Windows Essential Business Server 2008 rejects the POST request that the client sends.
RESOLUTION
To resolve this problem, follow these steps:
  1. Apply the hotfix that is described in Microsoft Knowledge Base article 940250. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
    940250 Description of the ISA Server 2006 hotfix package: July 16, 2007
  2. Copy the following script into Notepad:

    Note To resolve this problem in ISA Server 2006, use the following script. You do not have to apply the hotfix in this article for ISA Server 2006 SP1, but you have to use the script.
    Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "CookieFilterDecodeUEncoding"Const SE_VPS_VALUE = trueSub 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 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 using the .vbs file name extension. For example, save the file by using the following name:
    EnableKB940248.vbs
  4. At a command prompt, move to the location where you saved the EnableKB940248.vbs file.
  5. Run the following command:
    cscript EnableKB940248.vbs
Note After you follow these steps, only the query part of the URL can contain extended characters. The query part follows the question mark (?) in the URL. The part that comes before the question mark in the URL cannot contain extended characters even after you use this resolution.

If you want to remove the changes that are made when you run the script in step 5, run the following script:
Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "CookieFilterDecodeUEncoding"Const SE_VPS_VALUE = FalseSub SetValue()' Create the root object.Dim root ' The FPCLib.FPC root objectroot = CreateObject("FPC.Root")'Declare the other objects that are needed.Dim array ' An FPCArray objectDim VendorSets ' An FPCVendorParametersSets collectionDim VendorSet ' An FPCVendorParametersSet object' Get references to the array object' and to the network rules collection.array = root.GetContainingArrayVendorSets = array.VendorParametersSetsOn Error Resume NextVendorSet = VendorSets.Item(SE_VPS_GUID)If Err.Number <> 0 ThenErr.Clear()' Add the itemVendorSet = VendorSets.Add(SE_VPS_GUID)CheckError()WScript.Echo("New VendorSet added... " & VendorSet.Name)ElseWScript.Echo("Existing VendorSet found... value- " & VendorSet.Value(SE_VPS_NAME))End IfIf VendorSet.Value(SE_VPS_NAME) <> SE_VPS_VALUE ThenErr.Clear()VendorSet.Value(SE_VPS_NAME) = SE_VPS_VALUEIf Err.Number <> 0 ThenCheckError()ElseVendorSets.Save(False, True)CheckError()If Err.Number = 0 ThenWScript.Echo("Done with " & SE_VPS_NAME & ", saved!")End IfEnd IfElseWScript.Echo("Done with " & SE_VPS_NAME & ", no change!")End IfEnd SubSub CheckError()If Err.Number <> 0 ThenWScript.Echo("An error occurred: 0x" & Hex(Err.Number) & " " & Err.Description)Err.Clear()End IfEnd SubSetValue Change to:[INSERT CORRECTION]Const SE_VPS_GUID = "{143F5698-103B-12D4-FF34-1F34767DEabc}"Const SE_VPS_NAME = "CookieFilterDecodeUEncoding"Const SE_VPS_VALUE = falseSub SetValue()' Create the root object.Dim root ' The FPCLib.FPC root objectSet root = CreateObject("FPC.Root")'Declare the other objects that are needed.Dim array ' An FPCArray objectDim VendorSets ' An FPCVendorParametersSets collectionDim VendorSet ' An FPCVendorParametersSet object' Get references to the array object' and to the network rules collection.Set array = root.GetContainingArraySet VendorSets = array.VendorParametersSetsOn Error Resume NextSet VendorSet = VendorSets.Item( SE_VPS_GUID )If Err.Number <> 0 ThenErr.Clear' Add the itemSet VendorSet = VendorSets.Add( SE_VPS_GUID )CheckErrorWScript.Echo "New VendorSet added... " & VendorSet.NameElseWScript.Echo "Existing VendorSet found... value- " & VendorSet.Value(SE_VPS_NAME)End Ifif VendorSet.Value(SE_VPS_NAME) <> SE_VPS_VALUE ThenErr.ClearVendorSet.Value(SE_VPS_NAME) = SE_VPS_VALUEIf Err.Number <> 0 ThenCheckErrorElseVendorSets.Save false, trueCheckErrorIf Err.Number = 0 ThenWScript.Echo "Done with " & SE_VPS_NAME & ", saved!"End IfEnd IfElseWScript.Echo "Done with " & SE_VPS_NAME & ", no change!"End IfEnd SubSub CheckError()If Err.Number <> 0 ThenWScript.Echo "An error occurred: 0x" & Hex(Err.Number) & " " & Err.DescriptionErr.ClearEnd IfEnd SubSetValue
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Properties

Article ID: 940248 - Last Review: 04/07/2010 21:10:40 - Revision: 6.0

Microsoft Internet Security and Acceleration Server 2006 Standard Edition, Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition, Windows Essential Business Server 2008, Microsoft Forefront Threat Management Gateway 2010 Standard, Microsoft Forefront Threat Management Gateway 2010 Enterprise

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