Microsoft KB Archive/186043

= XCON: ECB Usage Count Events Appear with Large Directories =

Article ID: 186043

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q186043





SYMPTOMS
When you send a message to a Microsoft Exchange Server computer with a directory that contains an extremely large number of mailboxes and distribution lists, numerous 9405 events may appear in the event log with a source of MSExchangeMTA. These events indicate that the problem is related to the number of entity control blocks (ECBs) that are being used. This problem can also occur when you perform directory replication with a directory that contains an extremely large number of mailboxes and distribution lists.



CAUSE
This problem occurs because the ECB usage count is maintained incorrectly.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5. This problem has been corrected in the latest U.S. service pack for Microsoft Exchange Server version 5.5. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Keywords: kbbug kbfix KB186043

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