Microsoft KB Archive/187277

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

Article ID: 187277

Article Last Modified on 9/22/2005

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APPLIES TO


 * Microsoft Windows NT 4.0
 * Microsoft Internet Information Server 3.0

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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.

Keywords: kbbug kbfix kbqfe kbhotfixserver KB187277

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