Microsoft KB Archive/253358

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XWEB: Outlook Web Access Issue Generates Stack That Contains CDO!FEqBin+0xa

Article ID: 253358

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q253358


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
> u eip
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]


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


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

191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack


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

Keywords: kbhotfixserver kbqfe kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB253358