Microsoft KB Archive/899476

= FTP commands do not work if the client computer connects to a downstream ISA Server computer where firewall chaining is configured =

Article ID: 899476

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

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SYMPTOMS
You can log the client computer on to external File Transfer Protocol (FTP) sites. You can do this if the client computer is behind the downstream Microsoft Internet Security and Acceleration (ISA) Server computer that is in a firewall chain. However, if you send commands such as ls to the FTP server, you receive the following reply message, and then you receive no other replies from the server:

150 Opening ASCII mode data connection for file list



CAUSE
The problem occurs if the following conditions are true:
 * The firewall chaining is configured in the downstream ISA Server computer.
 * The downstream ISA Server computer points to an upstream ISA Server computer.
 * The client computer is configured with the firewall client and points to the downstream ISA Server computer.



Service pack information
To resolve this problem, obtain the latest service pack for Internet Security and Acceleration 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

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
For ISA Server 2004 Standard Edition, you must have Service Pack 1 (SP1) installed. For more information about how to obtain the latest ISA Server 2004 service pack, 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

Restart requirement
You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File Information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

ISA Server 2004 Standard Edition
    Date         Time   Version            Size    File name --  16-May-2005  03:57  4.0.2163.269      934,672  Wspsrv.exe

ISA Server 2004 Enterprise Edition
       Date         Time   Version            Size    File name --  01-Jun-2005  08:00  4.0.3440.269    1,058,072  Wspsrv.exe Note This hotfix is only required on the downstream ISA Server computer.

After you apply the hotfix
After you apply the hotfix on the downstream ISA Server computer, use the following script to manually turn on the EnableDownstreamSecondary option: Sub AddEnableSecondary

' Create the root object. Dim root ' The FPCLib.FPC root object Set root = CreateObject(&quot;FPC.Root&quot;)

'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( &quot;{143F5698-103B-12D4-FF34-1F34767DEabc}&quot; )

If Err.Number <> 0 Then Err.Clear

' Add the item Set VendorSet = VendorSets.Add( &quot;{143F5698-103B-12D4-FF34-1F34767DEabc}&quot; ) CheckError WScript.Echo &quot;New VendorSet added... &quot; & VendorSet.Name

Else WScript.Echo &quot;Existing VendorSet found... value- &quot; & VendorSet.Value(&quot;EnableDownstreamSecondary&quot;) End If

if VendorSet.Value(&quot;EnableDownstreamSecondary&quot;) <> true Then

Err.Clear VendorSet.Value(&quot;EnableDownstreamSecondary&quot;) = true

If Err.Number <> 0 Then CheckError Else VendorSets.Save false, true CheckError

If Err.Number = 0 Then WScript.Echo &quot;Done with EnableDownstreamSecondary, saved!&quot; End If       End If    Else WScript.Echo &quot;Done with EnableDownstreamSecondary, no change!&quot; End If

End Sub

Sub CheckError

If Err.Number <> 0 Then WScript.Echo &quot;An error occurred: 0x&quot; & Hex(Err.Number) & &quot; &quot; & Err.Description Err.Clear End If

End Sub

AddEnableSecondary



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Internet Security and Acceleration Server 2004 Service Pack 2.



MORE INFORMATION
For more information about how to install ISA Server 2004 hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base:

885957 How to install ISA Server hotfixes and updates

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

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver KB899476

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