XFOR: Chat Service May Terminate Unexpectedly When Sending a 0-Byte Privmsg or Whisper

ID: Q217149

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
Version : winnt:5.5 SP2
Platform : winnt
Issue type : kbbug