DOCUMENT:Q253358  10-NOV-2000  [exchange]
TITLE   :XWEB: OWA Issue Generates Stack That Contains CDO!FEqBin+0xa
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5
OPER/SYS:
KEYWORDS:exc55 kbExchange550preSP4fix kbExchange550sp4Fix

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

If there are a large number of Outlook Web Access (OWA) users, an Internet
Information Server (IIS) computer may crash and generate the following stack:

   

   > kv
   0000000001b0f8e0  000000006f078019  CDO!FEqBin+0xa (FPO: [2,0,2])
   0000000001b0f95c  000000006f077b3b  CDO!CMessage__V_ScRespond+0x4c9 (FPO: [ebp 0162ee48] [2,24,4])
   0000000001b0f968  000000006f075f6f  CDO!CMessage__M_ScDo_ReplyAll+0xb (FPO: [0,0,0])
   0000000001b0f96c  000000006f06ca90  CDO!CMessage__V_HrInvoke+0x68f (FPO: [0,0,0])
   0000000001b0f97c  0000000070bbd1e1  CDO!CDispatchObj__Invoke+0xa0 (FPO: [9,1,2])
   000000000162ee68  0000000070bb23bb  0x0000000070BBD1E1 (No FPO)
   00000000680b0009  ffffffffb80000ff  0x0000000070BB23BB (No FPO)
   ffffffffff000000  0000000000000000  0xFFFFFFFFB80000FF (No FPO)
   > r
   EAX=00000008  EBX=00000000  ECX=02dda650  EDX=00000008  ESI=02dda650  EDI=01befe88
   EIP=6f08acda  ESP=01b0f8dc  EBP=0000000b  EFL=00000202
   CS=001b  DS=0023  ES=0023  SS=0023  FS=003b  GS=0000
   > ln eip
   CDO!FEqBin+0xa
   CDO!HrFindDataRows-0x26
   > u eip
   CDO!FEqBin+0xa:
   6F08ACDA  8B0A             mov         ecx,dword ptr [edx]
   6F08ACDC  33C0             xor         eax,eax   
   6F08ACDE  3B0E             cmp         ecx,dword ptr [esi]
   6F08ACE0  7511             jne         FEqBin+23h         
   6F08ACE2  8B7E04           mov         edi,dword ptr [esi+4]
   6F08ACE5  8B7204           mov         esi,dword ptr [edx+4]
   6F08ACE8  33D2             xor         edx,edx
   6F08ACEA  F3A6             repe cmps   byte ptr [esi],byte ptr [edi]

CAUSE
=====

This issue can occur because there is a issue in the Cdo.dll file.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server 5.5.
For additional information, please see the following article in the Microsoft
Knowledge Base:

   Q191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5. This problem was first corrected in Exchange Server 5.5 Service
Pack 4.

Additional query words:

======================================================================
Keywords          : exc55 kbExchange550preSP4fix kbExchange550sp4Fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : winnt:5.5
Issue type        : kbbug
Solution Type     : kbfix

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

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