Microsoft KB Archive/187508

= FTP Server Fails to Respond If First Binding Does Not Work =

Article ID: 187508

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Internet Information Server 3.0
 * Microsoft Internet Information Server 4.0

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This article was previously published under Q187508



SYMPTOMS
Multihomed FTP server fails to respond to simple commands like DIR or GET.



CAUSE
If an Internet Information Server FTP server is running on a computer with two network interface cards and the first interface is not available (connection broken, for example). You will only get the normal status line from the FTP server.



RESOLUTION
Outgoing FTP traffic goes out the first entry in the route table to that network. On a multihomed computer on the same IP network, all outbound traffic will exit on the card that has the first entry in the route table. If you change the IP address of that card, it will change the location in the route table.

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 that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. 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.



MORE INFORMATION
With this fix, FTP makes back connections using the source IP address that the client connected to. This fixes problems with firewalls and any device that is expecting this behavior.

Keywords: kbbug kbfix KB187508

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