The FTP PORT Command Fails in IIS 3.0 When the System Has Multiple Network Interface Cards (187277)


The information in this article applies to:

  • the operating system: Microsoft Windows NT 4.0
  • Microsoft Internet Information Server 3.0
This article was previously published under Q187277

SYMPTOMS

There is the possibility that, when the PORT command is sent to the FTP services on a Microsoft Internet Information Server (IIS) version 3.0 system that has more than one network interface card, the PORT command will fail with the following error:
Error 425, can't open data connection

CAUSE

When the FTP server connects to the client's data socket, IIS 3.0 will bind the socket to the first available address on the system. After applying this patch IIS 3.0 will now bind to the address of the user initiating the request.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack


STATUS

Microsoft has confirmed this to be a problem in Microsoft Internet Information Server version 3.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Modification Type:MinorLast Reviewed:9/22/2005
Keywords:kbHotfixServer kbQFE kbbug kbfix kbQFE KB187277
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