Microsoft KB Archive/245565

= XCON: Message Delivery Failures Using the Internet Mail Service with NTLM Authentication/Encryption =

Article ID: 245565

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q245565





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, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB245565

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