You start the Microsoft Exchange RPC Client Access service on a Microsoft Exchange Server 2010 server that has only the Mailbox role installed. In this situation, the following event is logged in the Application log:
Log Name: Application Source: MSExchange Common Date: Date_Time_AM_PM Event ID: 106 Task Category: General Level: Error Keywords: Classic User: N/A Computer: myExchange2010.example.com Description: Performance counter updating error. Counter name is Client: Foreground RPCs Failed, category name is MSExchange RpcClientAccess. Optional code: 3. Exception: The exception thrown is : System.InvalidOperationException: The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly. at System.Diagnostics.PerformanceCounter.Initialize() at System.Diagnostics.PerformanceCounter.set_RawValue(Int64 value) at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.set_RawValue(Int64 value) Last worker process info : System.UnauthorizedAccessException: Access to the registry key 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14\Transport' is denied. at Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str) at Microsoft.Win32.RegistryKey.CreateSubKey(String subkey, RegistryKeyPermissionCheck permissionCheck, RegistrySecurity registrySecurity) at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetLastWorkerProcessInfo() Performance Counters Layout infomration: FileMappingNotFoundException for category MSExchange RpcClientAccess : Microsoft.Exchange.Diagnostics.FileMappingNotFoundException: Cound not open File mapping for name : Global\netfxcustomperfcounters.1.0msexchange rpcclientaccess at Microsoft.Exchange.Diagnostics.FileMapping.OpenFileMapping(String name, Boolean writable) at Microsoft.Exchange.Diagnostics.FileMapping..ctor(String name, Boolean writable) at Microsoft.Exchange.Diagnostics.PerformanceCounterMemoryMappedFile.Initialize(String fileMappingName, Boolean writable) at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetAllInstancesLayout(String categoryName)
This problem occurs because the performance counters of the RPC Client Access service are not installed when you install only the Mailbox role on an Exchange Server 2010 server. However, this does not affect the functionality of the Exchange Server 2010 server.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.