Wnap.exe GP Faults During a Windows NT Password Change (161767)


The information in this article applies to:

  • Microsoft SNA Server 2.11 SP1
  • Microsoft SNA Server 3.0
This article was previously published under Q161767

SYMPTOMS

During a Windows NT password change, the SNA Server Windows 3.x client software may encounter a general protection fault (GPF) and display the following error:
WNAP caused a General Protection Fault in module WDMOD.DLL at 0015:038E
This problem occurs if the combined user ID and domain name field length is seven or eight characters. This problem may also lead to a buffer pool corruption error on the server, causing SnaBase to fail abnormally with the following Windows NT application event log errors: 
   Event: 624
   Source: SNA Server
   Creating dump file C:\SNA\traces\snadump.log for SNABASE.EXE

   Event: 686
   Source: SNA Base Service
   SNA Server Internal buffer pool error.
    Reason  = Invalid Owner Id
    Module  = C:\SNA\system\SNABASE.EXE
    Process = 143
    Pool    = TRUSTED ELTS
    Details = Current Owner Id <value>, Correct ID <value>
NOTE: The SNA Server 2.0, 2.1 and 2.11 Windows 3.x clients do not support the Windows NT password change feature if the user's password has expired or if the user is required to change his or her password on the next logon. Password change support was added to the SNA Server Windows 3.x client software in 2.11 Service Pack 1.

CAUSE

The SNA Server client improperly generates the client logon response to send to the server when the combined user ID and domain are seven or eight characters long. In some cases, this causes an invalid message to be sent to the server, leading to an SnaBase buffer pool error.

RESOLUTION

To resolve this problem, obtain the hotfix mentioned below.

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 2.11 Service Pack 1 and 3.0. A supported fix is now available, and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.
Modification Type:MajorLast Reviewed:10/30/2003
Keywords:kbbug kbfix kbnetwork KB161767
©2003 Microsoft Corporation. All rights reserved.