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Q217149: XFOR: Chat Service May Terminate Unexpectedly

Article: Q217149
Product(s): Microsoft Exchange
Version(s): winnt:5.5 SP2
Operating System(s): 
Keyword(s): exc55sp2 EXC55SP3Fix
Last Modified: 01-OCT-1999

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

- Microsoft Exchange Server, version 5.5 SP2 
-------------------------------------------------------------------------------


SYMPTOMS
========

The Microsoft Exchange Chat Service version 5.5 Service Pack 2 may terminate
unexpectedly when sending a zero byte privmsg or whisper. A call stack similar
to the following may appear in the Drwtsn32.log file:

  

  FramePtr  RetAddr   Param1   Function Name
  02ffe894  0042030d  02ffeb20 CHATSVC!CIrcUser::SendMsg+0x5b4
  02ffea7c  0042d691  02ffeb20 CHATSVC!CChannel::SendMsg+0x7bd
  02ffec0c  00443685  02ffec2c CHATSVC!CIrcUser::CommandMessage+0x701
  02ffed44  00442f68  02ffedcc CHATSVC!CIrcUser::MessageInt+0x655
  02ffed98  00442b58  02ffedcc CHATSVC!CIrcUser::Message+0x288
  02fffdf0  00471d42  01d57050 CHATSVC!CIrcUser::Incoming+0x198
  02ffff5c  00471674  00000000 CHATSVC!CSocket::IOCompletionRead+0x642
  02ffff80  0047833c  00000000 CHATSVC!CSocket::IOCompletion+0x94
  02ffffb0  0047837b  02ffffec CHATSVC!CService::ThreadPool+0x13c
  02ffffb8  77f04f3e  01d4de5c CHATSVC!CService::ThreadPoolThunk+0xb
  02ffffec  00000000  00000000 0x77f04f3e

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 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

The English version of this fix should have the following file attributes or
later:

Component: Chat Service

+--------------------------+
| File name   | Version    | 
+--------------------------+
| Chatsvc.exe | 5.5.2549.0 | 
+--------------------------+


STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft Exchange Chat
Service that is included with Microsoft Exchange Server version 5.5 Service Pack
2. This problem was first corrected in Exchange Server 5.5 Service Pack 3.

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

Most IRC and IRCX clients prohibit sending a zero byte whisper or privmsg but
this problem can occur when you use Telnet. The problem can occur with any of
the following functions:

- PRIVMSG
- NOTICE
- WHISPER
- DATA
- REQUEST
- REPLAY



Additional query words:

======================================================================
Keywords          : exc55sp2 EXC55SP3Fix 
Technology        : kbExchangeSearch kbZNotKeyword2 kbExchange550SP2
Version           : winnt:5.5 SP2
Issue type        : kbbug
Solution Type     : kbfix

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

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