FTP: Use of Wild Card Port Results in Denial of Service

 Last reviewed: May 12, 1997
Article ID: Q105725

The information in this article applies to:
  • Microsoft Windows NT operating system version 3.1
  • Microsoft Windows NT Advanced Server version 3.1

SYMPTOMS

Internet fire wall gateways are configured to disallow remote TCP connection requests from systems using non-reserved ports. The Windows NT FTP service is bound to a wild card port when connecting to the client, which fails in these scenarios. On the client side, any commands like LS or GET appear to make your computer stop responding (hang) or eventually time-out.

STATUS

Microsoft has confirmed this to be a problem in Windows NT and Windows NT Advanced Server version 3.1. This problem was corrected in the latest U.S. Service Pack for Windows NT and Windows NT Advanced Server version 3.1. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): 

   S E R V P A C K

Additional query words: prodnt
Keywords : kbbug3.10 kbnetwork NTSrvWkst nttcp
Version : 3.1
Platform : WINDOWS

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Last reviewed: May 12, 1997
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