Found something in log files....
Engine.Navigator.QlikSense.SDK 19.19.4.0 Engine.Navigator.QlikSense.SDK.Resolvers.Contents.BaseBaseContentRequestResolver`1[[Qlik.Reporting.Engine.Messages.Requests.ImageNodeRequest, Qlik.Reporting.Engine.Messages, Version=19.18.0.0, Culture=neutral, PublicKeyToken=0f12475411058ae5]] 20190811T134942.330-04:00 WARN IAFACNET 0 0 0 0 0 0 0 0 Object PtDTb of Sense app 0985e863-42bd-47be-9efb-3830f49e9985 failed to render. ERROR: Qlik.Reporting.Engine.Messages.Exceptions.CefRenderingException: CEF rendering exception. Something went wrong with GRPC ---> System.AggregateException: One or more errors occurred. ---> Grpc.Core.RpcException: Status(StatusCode=Unavailable, Detail="Connect Failed")↓↓ at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()↓↓ at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)↓↓ at Grpc.Core.Internal.AsyncCall`2.UnaryCall(TRequest msg)↓↓ at Grpc.Core.DefaultCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request)↓↓ at Grpc.Core.Interceptors.InterceptingCallInvoker.b__3_0[TRequest,TResponse](TRequest req, ClientInterceptorContext`2 ctx)↓↓ at Grpc.Core.ClientBase.ClientBaseConfiguration.ClientBaseConfigurationInterceptor.BlockingUnaryCall[TRequest,TResponse](TRequest request, ClientInterceptorContext`2 context, BlockingUnaryCallContinuation`2 continuation)↓↓ at Grpc.Core.Interceptors.InterceptingCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request)↓↓ at ReportingWebRenderer.ScreenShooter.ScreenShooterClient.CreateWorkerPool(CreateWorkerPoolRequest request, CallOptions options)↓↓ at ReportingWebRenderer.ScreenShooter.ScreenShooterClient.CreateWorkerPool(CreateWorkerPoolRequest request, Metadata headers, Nullable`1 deadline, CancellationToken cancellationToken)↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.RestartGrpc()↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.b__26_0()↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.WorkItemQueue.Consume()↓↓ --- End of inner exception stack trace ---↓↓ at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)↓↓ at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)↓↓ at System.Threading.Tasks.Task.Wait()↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.StartGrpcIfNotRunning()↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.NewKeepGrpcAlive(Guid navRequestId, String appId, String identity, String typeId, String objId, Int32 width, Int32 height, Int32 dpi, Double zoom, Int32 timeout)↓↓ --- End of inner exception stack trace ---↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.NewKeepGrpcAlive(Guid navRequestId, String appId, String identity, String typeId, String objId, Int32 width, Int32 height, Int32 dpi, Double zoom, Int32 timeout)↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.MashupGrpcServer.Render(Guid navRequestId, String appId, String identity, String typeId, String objId, Int32 width, Int32 height, Int32 dpi, Double zoom, ImageType imageType, Int32 timeout)↓↓ at Engine.Navigator.QlikSense.SDK.Rendering.RenderingManager.Render(SenseApp doc, Guid navRequestId, String appId, String identity, String typeId, String objId, Int32 width, Int32 height, Int32 dpi, Double zoom, ImageType imageType, Int32 timeout)↓↓ at Engine.Navigator.QlikSense.SDK.SenseApp.ExportToImage(IGenericObject sheetObject, Guid requestId, Dictionary`2 propertyValues, Int32 width, Int32 height, Int32 dpi, Double zoom, KeepAspectRatioStrategy keepAspectRatioStrategy, FallbackStrategy fallbackStrategy)↓↓ at Engine.Navigator.QlikSense.SDK.Resolvers.Contents.SheetObjectImageNodeRequestResolver.Resolve(SenseApp doc, ImageNodeRequest request, GenericObject genericObject)↓↓ at Engine.Navigator.QlikSense.SDK.Resolvers.Contents.BaseContentRequestResolver`2.Resolve(SenseApp doc, TRequest request, IQixClassBase IGenericObject)↓↓ at Engine.Navigator.QlikSense.SDK.Resolvers.Contents.BaseBaseContentRequestResolver`1.Resolve(SenseApp doc, IContentRequest request, IQixClassBase senseObject)
I've found similar post who warn to restart Engine service and kill specific task...But error still occurs randomly
Regards
