Microsoft KB Archive/266742

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XCON: Message Transfer Agent Logs 9405 Exception Error Message When Starting the Service on Cluster Server

Article ID: 266742

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q266742


When the message transfer agent (MTA) service starts during cluster setup, the MTA may log the following incorrect 9405 error message:

An unexpected error has occurred which may cause the MTA to terminate.
Error: Allocate more buffer space 260. [BASE MAIN BASE 1] (16)

This error message is not harmful; the MTA service starts successfully and continues to run without any errors.


This issue can occur if more buffer space needs to be allocated for the returned node name. In the MTA service records this as fatal error, however, the MTA correctly allocates more buffer space.


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


To work around this issue, ignore the error message in the "Symptoms" section of this article.


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.

Additional query words: cluster mta 9405 buffer

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB266742