Released: 2024 H1 Cumulative Update for Exchange Server

Hi Guys,

We have just installed CU14 from CU12 via GUI setup, it went smoothly without error. EP was enabled since CU12. 

Run HealthChecker script returned zero error or vulnerabilities. Test-ServiceHealth has no error. Get-ServerComponentState all ok.  

The outlook clients are able to send/receive emails. But they are being disconnected from the server from time to time. Checking the event viewer, we see event 1325, 4999, 5011.

An unhandled exception occurred and the process was terminated.

Application ID: /LM/W3SVC/2/ROOT/EWS

Process ID: 31912

Exception: Microsoft.Ceres.Evaluation.DataModel.EvaluationException

Message: Cannot load wordbreaker for en or the fall back.

StackTrace:    at Microsoft.Ceres.NlpBase.WordBreaker.WordBreakerService.Tokenize(WordBreakerContext context, TextReader reader, String requestedLanguage, Boolean queryTokenize, IWordBreakerConsumer consumer)
   at Microsoft.Ceres.NlpBase.WordBreaker.QueryTreeWordBreaker.ProcessStringNode(Func`3 isExpandSegmentsEnabled, Func`3 isLanguageNeutralWordBreakerEnabled, String indexSystem, String language, QueryTreeModifier queryTree, TreeNode stringNode, Boolean expandSegmentsUnderNear, Boolean prefixAllQueryTerms)
   at Microsoft.Ceres.NlpBase.WordBreaker.QueryTreeWordBreaker.<>c__DisplayClass2.<ProcessQueryTree>b__1(TreeNode stringNode)
   at System.Linq.Enumerable.All[TSource](IEnumerable`1 source, Func`2 predicate)
   at Microsoft.Exchange.Query.Analysis.WordBreakStage.Execute(PipelineData pipelineData)
   at Microsoft.Exchange.Query.Analysis.Pipeline.Execute(PipelineData pipelineData)
   at Microsoft.Exchange.Services.Core.ExecuteSearch.QueryAnalyzer.ExecutePipeline(IEnumerable`1 refinementQueriesToUse)
   at Microsoft.Exchange.Services.Core.ExecuteSearch.QueryAnalyzer.AnalyzeQuery()
   at Microsoft.Exchange.Services.Core.ExecuteSearch.QueryAnalyzer.get_AnalyzedQuery()
   at Microsoft.Exchange.Services.Core.ExecuteSearch.ExecuteSearchQueryContext..ctor(SnapshotCollection snapshot, ExecuteSearchRequest searchRequest, ICallContext callContext, ISearchCommandFactory searchCommandFactory, IExecuteSearchSettings settings, IRefinersCacheFactory refinersCacheFactory, IQueryAnalyzerFactory queryAnalyzerFactory, ExecuteSearchMailboxDataSnapshot mailboxDataSnapshot)
   at Microsoft.Exchange.Services.Core.ExecuteSearch.ExecuteSearchManager.InternalExecuteFanOutSearch(ExecuteSearchRequest searchRequest, ICallContext callContext)
   at Microsoft.Exchange.Services.Core.ExecuteSearch.ExecuteSearchManager.ExecuteSearch(ExecuteSearchRequest searchRequest, ICallContext callContext)
   at Microsoft.Exchange.Services.Core.ExecuteSearchCommand.ExecuteInternal()
   at Microsoft.Exchange.Services.Core.ExecuteSearchCommand.Execute()
   at Microsoft.Exchange.Services.Core.ExceptionHandler`1.Execute(IRequestDetailsLogger logger, CreateServiceResult createServiceResult, Int32 index, ExecutionOption executionOption)
   at Microsoft.Exchange.Services.Core.BaseStepServiceCommand`3.InternalExecuteStep(Boolean& isBatchStopResponse)
   at Microsoft.Exchange.Services.Core.ServiceCommandBase`1.<ExecuteStep>b__81_0()
   at Microsoft.Exchange.Services.Core.ServiceCommandBase`1.<>c__DisplayClass87_0.<ExecuteHelper>b__0()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate)
   at Microsoft.Exchange.Services.Core.ServiceDiagnostics.SendWatsonReportOnUnhandledException(ICallContext callContext, Action methodDelegate)
   at Microsoft.Exchange.Services.Core.ServiceCommandBase`1.ExecuteHelper(Func`1 action)
   at Microsoft.Exchange.Services.Core.Types.ServiceTask`1.<>c__DisplayClass11_0.<ExecuteHelper>b__0()
   at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate)
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.SendWatsonReportOnGrayException(Action callback, Action exceptionHandlerCallback, Boolean isGrayExceptionTaskFailure)
   at Microsoft.Exchange.Services.Core.Types.ServiceTask`1.ExecuteHelper(Func`1 multiStepAction)
   at Microsoft.Exchange.Services.Core.Types.ServiceTask`1.<InternalExecute>b__7_0()
   at Microsoft.Exchange.Diagnostics.RequestDetailsLoggerBase`1.TrackLatency[TResult](Enum latencyMetadata, Func`1 method)
   at Microsoft.Exchange.Diagnostics.RequestDetailsLoggerBase`1.TrackLatency[TResult](Enum latencyMetadata, Func`1 method, Double& latencyValue)
   at Microsoft.Exchange.Services.Core.Types.ServiceTask`1.InternalExecute(TimeSpan queueAndDelay, TimeSpan totalTime)
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.<>c__DisplayClass33_0.<Execute>b__0()
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.LocalTimedCall(Action action)
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.ExecuteWithinCallContext(Action action)
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.Execute(TimeSpan queueAndDelayTime, TimeSpan totalTime)
   at Microsoft.Exchange.Services.Core.Types.BaseServiceTask`1.ExecuteLoop(Boolean synchronously)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

EWS is crashing and restarting every few seconds. Because of this, it creates unstable connection to the Outlook client.

We are running single Exchange 2019 server. 

Please shed some light on how to resolve these issues. Thank you.