DOCUMENT:Q245565 18-NOV-2000 [exchange] TITLE :XCON: Msg Delivery Fails Using Internet Mail Service w/NTLM PRODUCT :Microsoft Exchange PROD/VER::5.5 OPER/SYS: KEYWORDS:exc55 kbExchange550preSP4fix kbExchange550sp4Fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 5.5 ------------------------------------------------------------------------------- SYMPTOMS ======== When you receive e-mail over an Internet Mail Service that is configured to use NTLM Authentication and Encryption, mail service stops working intermittently, and the following event may be logged in the application Event Log. Event ID: 4131 Source: MSExchangeIMC Type: Information Category: Internal Processing Description: An unexpected error occurred in the Internet Mail Service. Information about this error is stored in the data portion of this event. Data: * Bytes O Words 0000: f3 03 15 00 0f 03 09 80 NOTE: The last four bytes correspond to a DWORD value of 0x8009030f (SEC_E_MESSAGE_ALTERED). CAUSE ===== Data is being received in blocks from the remote server and each block is being decrypted as it is received. In rare cases, two blocks may be received by the server and read in a single input/output (I/O) operation. In these cases, the second block is not processed. When the next block arrives, the Windows NT security components recognize an issue (absent data) in the encryption stream and return an error of SEC_E_MESSAGE_ALTERED. RESOLUTION ========== To resolve this problem, obtain the latest service pack for Exchange Server 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 STATUS ====== Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4. Additional query words: ====================================================================== Keywords : exc55 kbExchange550preSP4fix kbExchange550sp4Fix Technology : kbExchangeSearch kbExchange550 kbZNotKeyword2 Version : :5.5 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 2000.