Microsoft KB Archive/159500

= Using DLC and IPX Protocols May Corrupt Incoming Packets =

Article ID: 159500

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 3.51

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This article was previously published under Q159500



SYMPTOMS
When you use DLC and NWLINK protocols on Windows NT Server version 3.51, incoming DLC packets may become corrupted. The problem was observed on a multiprocessor IBM 720 computer with an IBM PCI ETHERNET adapter running Windows NT Server version 3.51 Service Pack 4, SNA Server and SMS 1.1.



CAUSE
In this case, SMS was generating local traffic (sending and receiving frames to itself) using UNC name over NWlink protocol. NWLink depends on the NDIS Wrapper or the NDIS MAC driver to provide loopback functionality. Consequently, frames are sent out on the wire and then received back in. Occasionally, under stress, incoming DLC frames were getting corrupted by the loopback nwlink data frames.



RESOLUTION
To work around this problem, install another protocol (TCP/IP or NetBEUI) using the Control Panel Network tool and make sure that NWLink is not the first protocol to bind to the Workstation service.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: ipx

Keywords: kbbug kbenv kbinterop kbnetwork KB159500

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