我最近在生产环境中配置了MongoDB和Sitecore 8 Analytics（rev.150812），它运行得很好。然而，奇怪的是，我在实时网站上的每个网页浏览的日志文件中都会收到此错误，不确定为什么会发生这种情况以及如何纠正它。它始终是一对错误（PostSessionEndPipeline失败+ PostSessionEndPipeline失败）。这发生在内容传送服务器上。 MongoDB在另一台服务器上。传送服务器位于一个Azure VM上，而MongoDB位于另一个VM上。它与会话超时有什么关系吗？
7072 00:09:19 ERROR PostSessionEndPipeline failed.
Exception: System.IO.IOException
Message: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Source: System
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at MongoDB.Bson.IO.ByteBufferFactory.LoadFrom(Stream stream)
at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializer serializer, IBsonSerializationOptions serializationOptions)
at MongoDB.Driver.Operations.QueryOperation`1.GetFirstBatch(IConnectionProvider connectionProvider)
at MongoDB.Driver.Operations.QueryOperation`1.Execute(IConnectionProvider connectionProvider)
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at MongoDB.Driver.MongoCollection.FindOneAs[TDocument](FindOneArgs args)
at Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbCollection.<>c__DisplayClass1d`1.<FindOneByIdAs>b__1c()
at Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbCollection.Execute(Action action, ExceptionBehavior exceptionBehavior)
at Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbCollection.FindOneByIdAs[TDocument](BsonValue value, Nullable`1 exceptionBehavior)
at Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbDriver.FindOneByIdAs[T](Object key)
at Sitecore.Analytics.Data.DataAccess.MongoDb.MongoDbDictionary.LoadAs[T](Object key)
at Sitecore.Analytics.Data.Dictionaries.TrackingDictionary`2.Get(TKey key, LookupStrategy strategy)
at Sitecore.Analytics.Pipelines.EnsureClassification.GetClassificators.Process(EnsureClassificationPipelineArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Analytics.Pipelines.PostSessionEnd.CommitSession.Process(PostSessionEndArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Web.Application.RaiseSessionEndEvent(HttpApplication context)
Nested Exception
Exception: System.Net.Sockets.SocketException
Message: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
Source: System
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
1572 00:09:19 ERROR SessionEndPipeline failed.
Exception: System.IO.IOException
Message: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Source: System
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at MongoDB.Bson.IO.ByteBufferFactory.LoadFrom(Stream stream)
at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializer serializer, IBsonSerializationOptions serializationOptions)
at MongoDB.Driver.Operations.QueryOperation`1.GetFirstBatch(IConnectionProvider connectionProvider)
at MongoDB.Driver.Operations.QueryOperation`1.Execute(IConnectionProvider connectionProvider)
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at Sitecore.Analytics.Automation.Data.MongoDbAutomationProvider.GetAutomationDocuments(ID contactId, IReadOnlyCollection`1& stateDocuments, IReadOnlyCollection`1& transitionDocuments)
at Sitecore.Analytics.Automation.Data.MongoDbAutomationProvider.GetAutomationContext(ID contactId, DateTime timestampExclusive)
at Sitecore.Analytics.Automation.Data.AutomationProvider.GetAutomationContext(ID contactId)
at Sitecore.Analytics.Automation.Data.AutomationStateManager.Create(Contact contact)
at Sitecore.Analytics.Automation.ContactAutomationEvents.Run(Session session, PageEventItem pageEventDefinitionItem)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Web.Application.RaiseSessionEndEvent(HttpApplication context)
Nested Exception
Exception: System.Net.Sockets.SocketException
Message: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
Source: System at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)