Microsoft KB Archive/829892

= You Cannot Connect to External FTP Sites by Using a WRQ Reflection FTP Client through ISA Server 2000 =

Article ID: 829892

Article Last Modified on 6/14/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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SYMPTOMS
When you use a WRQ Reflection FTP client that is configured to use the SOCKS version 4 protocol, you may not be able to connect to external FTP sites through Microsoft Internet Security and Acceleration (ISA) Server 2000. The FTP client displays the following error message:

A connection can not be established. Please try again.



CAUSE
The SOCKS version 4 Reflection FTP client spreads its SOCKS CONNECT request over two TCP segments. The built-in SOCKS application filter in ISA Server does not handle this correctly, and the SOCKS connection fails.



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
To install this hotfix, you must have ISA Server Service Pack 1 (SP1) installed on your computer. For additional information about how to obtain the latest ISA Server service pack, click the article number below to view the article in the Microsoft Knowledge Base:

313139 How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack

File Information
The English version of this hotfix has the file attributes (or later) 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. Date        Time   Version       Size    File name -- 09-Oct-2003 15:22  3.0.1200.295  34,064  Socksflt.dll This fix also applies to the French, German, Spanish, and Japanese versions of ISA Server.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.

Keywords: kbhotfixserver kbqfe kbhotfixserver kbqfe kbbug kbfix KB829892

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