Topic Last Modified: 2010-02-15

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source

MSExchange ADAccess

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Active Directory Access

Rule Name

Couldn't create the shared memory heap. This could result from internal Epoxy (ExIPC) failures or the system may be running out of memory.


This Error event indicates that the Microsoft Exchange Active Directory Topology service (MSExchangeADTopologyService.exe) startup will fail because a shared memory heap cannot be created. This situation may occur because:

  • Internal Epoxy (ExIPC) has failed. Epoxy is a shared memory mechanism that enables Internet Information Services (Inetinfo.exe) and the Microsoft Exchange Information Store service (Store.exe) processes to quickly shuttle data back and forth. This memory is also used by DSAccess, the Exchange component that caches Active Directory information.

  • Physical memory limits are exceeded.

  • Too many other processes are running DSAccess. Epoxy has a limit of 10 processes per heap.

User Action

To resolve this error, restart the computer.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.