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

An RPC request to the Microsoft Exchange Active Directory Topology service failed.


This Error event indicates that a remote procedure call (RPC) to the Microsoft Exchange Active Directory Topology service failed. RPC is an interprocess communication (IPC) mechanism that enables seamless communication between client and server applications. In an Exchange environment, the Exchange server that is running on a member server acts as a client to the Active Directory information that resides on a domain controller. This event may occur if the RPC service is stopped or disabled. This event may also occur if the ports that are used by the RPC service are blocked by a firewall.

For more information about RPC and how it works, see What is RPC? and How RPC Works at the Windows Server TechCenter.

User Action

To resolve this error, do one or more of the following:

  • Make sure that the Status of the RPC service is Started.

    • If the Status of the service is Started, stop and then start the service.

    • If the Status of the service is not set to Started, start the service.

  • Make sure that the network ports that are used by RPC are not blocked by a firewall. For more information, see How RPC Works at the Windows Server TechCenter.

    Note   RPC generally uses port 135.

  • Make sure that the Exchange server that logged this event is configured to point to a valid DNS server. For more information about how to troubleshoot DNS issues, see DNS Troubleshooting.

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.