You cannot cache HTTP content on a downstream server that is running ISA Server 2004

Article translations Article translations
Article ID: 915025 - View products that this article applies to.
Expand all | Collapse all

SYMPTOMS

Consider the following scenario:
  • You have a downstream server that is running Microsoft Internet Security and Acceleration (ISA) Server 2004.
  • You try to cache HTTP content on this server.
  • An upstream proxy server is configured to request client authentication.
In this scenario, you cannot cache HTTP content on the downstream server.

CAUSE

By design, the downstream ISA Server computer does not cache content if the upstream proxy server is configured to request client authentication.

RESOLUTION

To resolve this problem, obtain the latest service pack for ISA Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
891024 How to obtain the latest ISA Server 2004 service pack

STATUS

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

MORE INFORMATION

After you install ISA Server 2004 Service Pack 2 (SP2), you can configure the downstream ISA Server computer to cache content even if the upstream proxy server is configured to request client authentication. To configure the downstream ISA Server computer to cache content, change the DontMarkSessionAsPrivateIfProxyAuthSeen parameter. To do this, follow these steps.

Note The DontMarkSessionAsPrivateIfProxyAuthSeen parameter is the name of a vendor parameter set that can be modified after you install ISA Server 2004 SP2.
  1. Copy and paste the following code into Notepad:
    Sub AddDontMarkSessionAsPrivateIfProxyAuthSeen()
    
    ' Create the root object.
    Dim root ' The FPCLib.FPC root object
    Set root = CreateObject("FPC.Root")
    
    ' Declare the other objects that are required.
    Dim array ' An FPCArray object
    Dim VendorSets ' An FPCVendorParametersSets collection
    Dim VendorSet ' An FPCVendorParametersSet object
    
    ' Obtain 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( "{143F5698-103B-12D4-FF34-1F34767DEabc}" )
    
    If Err.Number <> 0 Then
    Err.Clear
    
    ' Add the item.
    Set VendorSet = VendorSets.Add( "{143F5698-103B-12D4-FF34-1F34767DEabc}" )
    CheckError
    WScript.Echo "New VendorSet added... " & VendorSet.Name
    
    Else
    WScript.Echo "Existing VendorSet found... value- " & VendorSet.Value("DontMarkSessionAsPrivateIfProxyAuthSeen")
    End If
    
    if VendorSet.Value("DontMarkSessionAsPrivateIfProxyAuthSeen") <> 1 Then
    
    Err.Clear
    VendorSet.Value("DontMarkSessionAsPrivateIfProxyAuthSeen") = 1
    
    If Err.Number <> 0 Then
    CheckError
    Else
    VendorSets.Save false, true
    CheckError
    
    If Err.Number = 0 Then
    WScript.Echo "Done, saved!"
    End If
    End If
    Else
    WScript.Echo "Done, 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
    
    AddDontMarkSessionAsPrivateIfProxyAuthSeen
    
  2. Save the file as "DownstreamISAcacheContent.vbs."
  3. To run the code, type the following command at a command prompt:
    cscript. DownstreamISAcacheContent.vbs
    Note You must run the code from the same location in which you saved the DownstreamISAcacheContent.vbs file in step 2.
Notes
  • This code sets the DontMarkSessionAsPrivateIfProxyAuthSeen parameter to a value of 1. This value enables the downstream ISA Server computer to cache content even if the upstream proxy server is configured to request client authentication.
  • If you select the Content requiring user authentication for retrieval option when you create a cache rule in ISA Server 2004, the downstream ISA Server computer caches content from the upstream proxy server. The downstream server also caches content that is authenticated by any server, such as by a Web server.
For more information about the standard terminology that is used to describe Microsoft software updates, 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: 915025 - Last Review: October 9, 2011 - Revision: 2.0
APPLIES TO
Keywords: 
kbqfe kbbug kbfix KB915025

Give Feedback

 

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com