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RFC 959 allows for the use of the PORT command, a remote connection to another TCP\IP over a passive connections, to be established based on the port address given by client. This is commonly done with FTP server-to-server transfers. This behavior was made optional to provide added security to the FTP service.
The FTP service compares the IP address that makes the connection and the address issuing the PASV command. If they are different, the FTP service does not allow the connection. When you attempt to do this on the Microsoft FTP Server, this operation fails, regardless of the settings.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
Microsoft has confirmed that this is a problem in Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 1.
Windows NT 4.0
Microsoft has confirmed that this is a problem in Internet Information Server 4.0. Microsoft is researching this problem and will post more information in this article when the information becomes available.