Symptoms
Microsoft Outlook clients that use MAPI over HTTP to connect to Microsoft Exchange Server 2013 mailboxes are intermittently disconnected. For example, Cached Mode users see a Disconnected message displayed on the Outlook status bar. Also, Online Mode users receive the following error message when they try to start Outlook:
Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. You must connect to Microsoft Exchange with the current profile before you can synchronize your folders with your Outlook data file (.ost).
Additionally, the following events are logged in the Application log in Event Viewer on the affected server that's running Exchange Server 2013:Log name: ApplicationID: 1309Level: WarningSource: ASP.NET 4.0.30319.0Message: Event code: 3005Event message: An unhandled exception has occurred.Event ID: 35ca26135b3f454b900e631af67eeec8Event sequence: 2vent occurrence: 1Event detail code: 0Application information:Application Virtual Path: /mapi/nspiApplication Path: D:\Exchange\V15\ClientAccess\mapi\nspi\Process information:Process ID: 5096Process name: w3wp.exeAccount name: NT AUTHORITY\SYSTEMException information:Exception type: HttpExceptionException message: RpcObjectSetType at System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)RpcObjectSetType at Microsoft.Exchange.Rpc.RpcServerBase.ThrowRpcException(String message, Int32 rpcStatus) at Microsoft.Exchange.Rpc.ProcessAccess.ProcessAccessRpcServer.RegisterInterface(Void* ifSpec, ValueType mgrTypeGuid, _GUID* pMgrTypeUuid, Void* pMgrEpv, UInt32 flags, UInt32 maxCalls) at Microsoft.Exchange.Rpc.RpcServerBase.RegisterServer(Type type, ObjectSecurity sd, UInt32 desiredAccess, ValueType mgrTypeGuid, Void* mgrEpv, String annotation, Boolean isLocalOnly, Boolean autoListen, UInt32 maxCalls) at Microsoft.Exchange.Data.ApplicationLogic.ProcessAccessManager.RegisterComponent(IDiagnosable diagnosable)Request information:Request path: /mapi/nspi/User: Is authenticated: FalseAuthentication Type: Thread account name: NT AUTHORITY\SYSTEMThread information:Thread ID: 64Thread account name: NT AUTHORITY\SYSTEMIs impersonating: FalseStack trace: at System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)
Cause
This issue occurs when the MSExchangeMapiMailboxAppPool or MSExchangeMapiAddressBookAppPool application pool encounters an unhandled exception.
Resolution
To fix this issue, install Cumulative Update 11 for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
