DOCUMENT:Q246173 18-MAY-2001 [iis] TITLE :FTP Server Does Not Allow FTP Server-to-Server Connection PRODUCT :Internet Information Server PROD/VER::4.0,5.0 OPER/SYS: KEYWORDS:kbWin2000PreSP1Fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server 4.0 - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- 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 ========== Windows 2000 ------------ To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, please see the following article in the Microsoft Knowledge Base: Q260910 How to Obtain the Latest Windows 2000 Service Pack STATUS ====== Windows 2000 ------------ Microsoft has confirmed this to be 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 this to be a problem in Internet Information Server 4.0.Microsoft is researching this problem and will post more information here in the Microsoft Knowledge Base when it becomes available. Additional query words: ====================================================================== Keywords : kbWin2000PreSP1Fix Technology : kbiisSearch kbExchange400 kbGraph500 Version : :4.0,5.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.