Process %1 (PID=%2). An internal memory cache error occurred. A hash table iterator is no valid. This event can be caused by internal memory issues. You may be able to resolve this event by restarting the Microsoft Exchange Active Directory Topology service. If the error persists, restart the Exchange server that logged this event.

Details
Product: Exchange
Event ID: 2055
Source: MSExchange ADAccess
Version: 8.0
Symbolic Name: DSC_EVENT_LK_BAD_ITERATOR
Message: Process %1 (PID=%2). An internal memory cache error occurred. A hash table iterator is no valid. This event can be caused by internal memory issues. You may be able to resolve this event by restarting the Microsoft Exchange Active Directory Topology service. If the error persists, restart the Exchange server that logged this event.
   
Explanation

This Error event indicates that a hash table iterator is invalid. A hash table stores frequently accessed and fast changing information in the memory cache. The records are added and deleted dynamically to maintain optimal memory use. An iterator is used to move through the records of a hash table. If the iterator is invalid, navigating in a hash table is not possible.

This event may be caused by internal memory issues.

   
User Action

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

  • Restart the Microsoft Exchange Active Directory® Topology service. If the error persists, restart the Exchange server that logged this event.

  • Examine related events in the Application log and System log for Warning events and Error events that come before or after this event. These related events may provide more information about the root cause of this error.

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.

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