DOCUMENT:Q245453  13-JUN-2001  [sna]
TITLE   :TN3270 Server Access Violation in Mngext!MngDeleteObject()
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
OPER/SYS:
KEYWORDS:kbDSupport kbSNA400sp4fix kbSNA400PreSP4fix

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
-------------------------------------------------------------------------------

SYMPTOMS
========

The SNA Server TN3270 Server process (Tn3servr.exe) may fail unexpectedly with
an access violation in routine mngext!MngDeleteObject. If Drwtsn32.exe is
configured as the default debugger, a Drwtsn32.log file will be created and will
include the following failure information:

Application exception occurred:
        App: exe\tn3servr.dbg (pid=process id)
        When: (date and time)
        Exception number: c0000005 (access violation)

[...]

State Dump for Thread Id (thread)

eax=00000000 ebx=00000000 ecx=00000000 edx=0ca40440 esi=0c9fff98 edi=00243160
eip=60a01dd7 esp=0c9fff78 ebp=77f67500 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00000246

function: MngDeleteObject
        60a01db8 59               pop     ecx
        60a01db9 c20800           ret     0x8
        60a01dbc 6a00             push    0x0
        60a01dbe 8d44240c         lea     eax,[esp+0xc]
        60a01dc2 6a00             push    0x0
        60a01dc4 50               push    eax
        60a01dc5 8bcf             mov     ecx,edi
        60a01dc7 c70600000000     mov     dword ptr [esi],0x0
        60a01dcd ff15d010a060 
                   call    dword ptr [_imp_?GetNotify (60a010d0)]
        60a01dd3 8b4c2408         mov     ecx,[esp+0x8]          
FAULT ->60a01dd7 8b11             mov     edx,[ecx] 
        60a01dd9 ff5220           call    dword ptr [edx+0x20]   
        60a01ddc 5f               pop     edi
        60a01ddd 5e               pop     esi
        60a01dde 59               pop     ecx
        60a01ddf c20800           ret     0x8

*---- Stack Back Trace ----*

FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
77f67500 8b000000 83042454 7500147a 42ff904f 8b197504 mngext!MngDeleteObject

CAUSE
=====

The management status reporting interface running underneath the TN3270 server
was attempting to delete an object after it had already been freed, causing an
access violation.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For
additional information, please see the following article in the Microsoft
Knowledge Base:

   Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



STATUS
======

Microsoft has confirmed this to be a problem in SNA Server 4.0 Service Pack 1,
Service Pack 2, and Service Pack 3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.

Additional query words:

======================================================================
Keywords          : kbDSupport kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3
Version           : WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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Copyright Microsoft Corporation 2001.