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Microsoft KB Archive/172606

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Knowledge Base

SNA Server Access Violation When Receiving Invalid XID Frames

Article ID: 172606

Article Last Modified on 7/14/2004


  • Microsoft SNA Server 3.0 Service Pack 4
  • Microsoft SNA Server 4.0

This article was previously published under Q172606


SNA Server may encounter access violations or hard-coded break points within Snaservr.exe in an environment where corrupt 802.2 frames are being sent as a result of a bad network card or network card driver. The failures result in a Drwtsn32.log that may show the following type of failures:

Application exception occurred:
App: snalink.DBG (pid=216)
When: 7/22/1997 @ 13:53:4.828
Exception number: 80000003 (hardcoded breakpoint)

In the Windows NT Application log the following event will be logged with the same timestamp as the hard-coded break point:

   Event ID : 686
   Source: DLC Link Service
   Type: Error
   Category: None
   Description: SNA Server Internal buffer pool error.
      Reason  = Invalid Owner Id
      Module  = D:\sna\system\SNALINK.EXE
      Process = 216
      Pool    = TRUSTED ELTS
      Details = Current Owner Id D8H, Correct ID 1BF801EEH
      EXPLANATION - While processing a buffer pool request, it was noticed
      that the buffer pool had been corrupted.

SNA traces of the failures may show corrupted XID frames or terminate during the processing of an XID.


If an XID is received with an incorrect length field, the SNA Server XID parsing code fails to handle the processing of the frame correctly.

Please refer to the IBM SNA Formats Guide (GA27-3136) for more information on XID formats.


Microsoft has confirmed this to be a problem in SNA Server versions 3.0 and 3.0 Service Pack 1 (SP1). This problem was corrected in the latest SNA Server version 3.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):



With the fix applied, the XID parsing behavior of SNA Server correctly handles XIDs with invalid length fields.

Additional query words: EventID 686 Hardcoded

Keywords: kbbug kbfix kbnetwork KB172606