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Q173173: SNA Manage Agent Traps After Saving Configuration Change

Article: Q173173
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0,3.0 SP1
Operating System(s): 
Keyword(s): kbnetwork
Last Modified: 02-APR-2000

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

- Microsoft SNA Server, versions 3.0, 3.0 SP1 
-------------------------------------------------------------------------------


SYMPTOMS
========

After you make a configuration change using SNA Manager, the SNA Server Manage
Agent process (Mngagent.exe) may encounter an access violation, causing the SNA
Server status in Manager to appear as offline. The SNA Server service will
continue to run properly, but no status information is displayed for the
server.

When this problem occurs, the following <ntroot>\Drwtsn32.log entry is
logged:

  Application exception occurred:
  App: mngagent.dbg (<process ID>)
  Exception number: c0000005 (access violation)

CAUSE
=====

This problem is rare. An uninitialized variable leads to a Manage Agent access
violation in CAgtPxyRecExchange::SendModifyUse.

RESOLUTION
==========

To resolve this problem:

- Manually restart the SNA Manage Agent (Mngagent.exe) on the SNA Server
  computer.

STATUS
======

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):

  S E R V P A C K


MORE INFORMATION
================

  State Dump for Thread Id <thread>

  eax=00000000 ebx=00000002 ecx=0035ebb0 edx=003cc174 esi=0038ff00
  edi=0000000a
  eip=0100cb97 esp=0131fe3c ebp=0d83cff0 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: CAgtPxyRecExchange::SendModifyUse
       0100cb79 85c0             test    eax,eax
       0100cb7b 7407            jz CAgtPxyRecExchange::SendModifyUse+0x84
  (0100cb84)
       0100cb7d 8b4808           mov     ecx,[eax+0x8]
  ds:0068e922=????????
       0100cb80 894c2428         mov     [esp+0x28],ecx
 ss:019ae75f=????????
       0100cb84 837d0800         cmp    dword ptr [ebp+0x8],0x0
  ss:0decb912=????????
       0100cb88 747c           jz CAgtPxyRecExchange::SendModifyUse+0x106
  (0100cc06)
       0100cb8a 837c242800       cmp   dword ptr [esp+0x28],0x0
  ss:019ae75f=????????
       0100cb8f 747c           jz CAgtPxyRecExchange::SendModifyUse+0x10d
  (0100cc0d)
       0100cb91 f6450c04         test    byte ptr [ebp+0xc],0x4
  ss:0decb912=??
       0100cb95 7506           jnz CAgtPxyRecExchange::SendModifyUse+0x9d
  (0100cb9d)
  FAULT ->0100cb97 f6400c04         test    byte ptr [eax+0xc],0x4
  ds:0068e922=??

  *----> Stack Back Trace <----*

  FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
  0131fe64 01001ea8 00000000 0dbacff0 0038ff00 003d5750
  mngagent!CAgtPxyRecExchange::SendModifyUse (FPO: [EBP 0x0131fe9c]
  [5,7,4])

  0131fe8c 6098b267 0131fe9c 00000002 0038fec0 00000b22
  mngagent!CStdAgentProxy::OnModify

  (FPO: [EBP 0x0131ffb8] [1,0,4])
  0131fea8 01008ca5 61490c40 00000000 0121ffb8 77fa1773
  mngbase!CNotifyQueue::Dispatch  (FPO: [0,4,1])

  0131ffb8 77f46c2e 0121ffb8 61490c40 00000000 0121ffb8
  mngagent!DoAgentProxy (UKNOWN FPO TYPE)

  61490c40 1274c085 7401f883 02f8831a 01b85a74 c2000000
  kernel32!BaseThreadStart

Additional query words:

======================================================================
Keywords          : kbnetwork 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ300SP1
Version           : WINDOWS:3.0,3.0 SP1
Issue type        : kbbug
Solution Type     : kbfix

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

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