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

ID: Q217149

The information in this article applies to:

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

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.5 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp
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



NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:
Q154871 Determining If You Are Eligible for No-Charge Technical Support


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.


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:

Additional query words: 


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

Last Reviewed: August 3, 1999