This article was previously published under Q187508
This article has been archived. It is offered "as is" and will no longer be updated.
Multihomed FTP server fails to respond to simple commands like DIR or GET.
If an Internet Information Server FTP server is running on a computer withtwo network interface cards and the first interface is not available(connection broken, for example). You will only get the normal status linefrom the FTP server.
Outgoing FTP traffic goes out the first entry in the route table to thatnetwork. On a multihomed computer on the same IP network, all outboundtraffic 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 inthe 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 theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
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.
With this fix, FTP makes back connections using the source IP address thatthe client connected to. This fixes problems with firewalls and any devicethat is expecting this behavior.