DOCUMENT:Q217149 01-OCT-1999 [exchange] TITLE :XFOR: Chat Service May Terminate Unexpectedly PRODUCT :Microsoft Exchange PROD/VER:winnt:5.5 SP2 OPER/SYS: KEYWORDS:exc55sp2 EXC55SP3Fix ====================================================================== ------------------------------------------------------------------------------- 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 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.