Microsoft KB Archive/187780

= XADM: Exception Error 0XC0000009A with POP3 or SMTP Usage =

Article ID: 187780

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Windows NT 4.0

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This article was previously published under Q187780





SYMPTOMS
 When you are running Microsoft Exchange Server 5.5 on Windows NT Server 4.0 with Service Pack 3, you receive an exception error when a heavy load is placed on the local directory. When POP3 clients or SMTP clients initialize sessions with their Microsoft Exchange directory, an exception is generated, stating:

The exception unknown software exception (0XC0000009A) occurred in the

application at the location 0x77f88C01. Click OK to terminate

application.

 If you try to stop the Exchange services, the computer stops responding (hangs). You must restart your computer to regain control. On a computer with the SMTP or POP3 user capability that is in the process of high user load, the system produces the exception mentioned previously.



CAUSE
A Max File Handle Limitation has been reached on this computer. The registry settings at  HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/SMTPSRV/Parameters for the following:


 * Cache entry #
 * Cache table
 * TTL

are insufficient to handle the load.



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was corrected in the latest Windows NT 4.0 U.S. Service Pack. 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



MORE INFORMATION
The SMTPSRV key of the registry is only present when Internet Information Server version 3.0 or 4.0 is installed.

Keywords: kbbug kbfix KB187780

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