FTP Server Does Not Allow FTP Server-to-Server Connection

• Microsoft Internet Information Server version 4.0

SYMPTOMS

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. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

Q147621 IIS FTP Service Registry Parameters

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

   Date      Time    Version      Size    File name     Platform
   -------------------------------------------------------------
   11\17\99  5:04PM  4.02.0732    80KB    Ftpsvc2.dll   x86
   11\17\99  5:05PM  4.02.0732    124KB   Ftpsvc2.dll   alpha
 

STATUS

Microsoft has confirmed this to be a problem in Internet Information Server 4.0.

Additional query words:

Keywords :
Version : winnt:4.0
Platform : winnt
Issue type : kbbug