Process %1 (PID=%2). The maximum allowed number of processes are using the DSAccess memory cache. No more processes can use the API. Try 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: 2051
Source: MSExchange ADAccess
Version: 8.0
Symbolic Name: DSC_EVENT_MAX_PROCS_USED
Message: Process %1 (PID=%2). The maximum allowed number of processes are using the DSAccess memory cache. No more processes can use the API. Try 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 more than 32 processes have tried to access the DSAccess memory cache. Under ordinary operating conditions, it is uncommon for more than 32 processes to try to access the DSAccess memory cache. This event may occur when one or more processes that use the DSAccess memory cache exit unexpectedly without releasing the memory cache.

   
User Action

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

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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