Article ID: 817829 - View products that this article applies to.
Internal SecureNAT and Internet Security and Acceleration Server (ISA) Firewall clients may not open the FTP data connection to an FTP server that is using passive mode FTP (PASV). The FTP server may return one of the following error messages:
426 Connection closed; transfer aborted.
In some circumstances, the FTP client may seem to stop responding (hang) or time out. FTP clients that use active mode FTP (PORT) work without error.
425 Can't open data connection.
When the client establishes a passive mode FTP connection to an FTP server, the client must establish both connections. The FTP server returns the TCP port used for the FTP data connection. The FTP server expects this FTP data connection to come from the same IP address as the FTP control channel. If the connection comes from a different IP address, the FTP server may reject or close the connection because this may be a passive mode port theft attempt.
When ISA has more than one IP address bound to the external interface, the source IP address for the FTP data connection may not be the primary IP address. Instead, the source IP address may be one of the secondary IP addresses bound to the external interface. With the hotfix installed, ISA always uses the primary IP address for both types of connections.
You must install ISA Server Service Pack 1 (SP1) before you install the following hotfix.
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:
313139A supported hotfix is 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 software update that contains this hotfix.
(http://support.microsoft.com/kb/313139/EN-US/ )How to Obtain the Latest Internet Security and Acceleration Server 2000 Service Pack
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
This fix also applies to the French, German, Spanish, and Japanese versions of ISA Server.
Date Time Version Size File name ----------------------------------------------------- 02-Apr-2003 11:52 3.0.1200.260 19,216 Ftpfltr.dll
To work around the problem, use one of the following methods:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Article ID: 817829 - Last Review: June 14, 2007 - Revision: 1.7