Microsoft Exchange couldn’t load the Active Directory recipient cache performance counters %1.

This Error event indicates that the specified Active Directory directory service recipient cache performance counters for the Microsoft Exchange Transport service were unable to load.

This error may be caused by any of the following conditions:

• One or more Active Directory recipient cache performance counters are enabled. However, the Microsoft Exchange Transport service is stopped or in an unresponsive state.

• The registry key that controls the specified Active Directory recipient cache performance counters is missing or corrupted, or has insufficient permissions assigned to it.

  The Active Directory recipient cache performance counters are located at: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange Recipient Cache\Performance

  By default, the following permissions are assigned to this registry key:

  • Administrators: Full Control

  • Creator Owner: Full Control

  • System: Full Control

  • Authenticated Users: Read

  • Server Operators: Special permissions: All permissions except: Full Control, Create Link, Write DAC or Write Owner.

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

• Restart the Microsoft Exchange Transport service.

• Unload and reload the Active Directory recipient cache performance counters by following these steps:

  1. At a command prompt on the Hub Transport server, run the following command:

     Unlodctr “MSExchange Recipient Cache”

     The successful completion of this step should generate the following Application event log entry:

     Source: LoadPerf

     Event ID: 1001

     Description: Performance counters for the MSExchange Recipient Cache (MSExchange Recipient Cache) service were removed successfully. The Record Data contains the new values assigned of the system Last Counter and Last Help registry entries.

  2. Run the following command:

     Lodctr “C:\Program Files\Microsoft\Exchange Server\Setup\Perf\ADRecipientCachePerformanceCounters.ini”

     The successful completion of this step should generate the following Application event log entry:

     Source: LoadPerf

     Event ID: 1000

     Description: Performance counters for the MSExchange Recipient Cache (MSExchange Recipient Cache) service were loaded successfully. The Record Data contains the new index values assigned to this service.

  3. Restart the server for the changes to take effect.

• Verify that the registry key for the Active Directory recipient cache performance counters exists and has the correct permissions assigned to it.

• Remove the specified performance counter objects from the Microsoft Windows Server 2003 Performance console or the System Monitor snap-in.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.