我有一个应用程序在sitecore 7.5上运行mongo（副本服务器上有3个服务器），每当高负载时，mongo没有响应，我收到以下错误。
System.Net.Sockets.SocketException: 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 xx.xx.xx.xxx:27017
Sample stack trace
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.Connect(EndPoint remoteEP)
at System.Net.Sockets.TcpClient.Connect(IPEndPoint remoteEP)
at MongoDB.Driver.Internal.MongoConnection.Open()
at MongoDB.Driver.Internal.MongoConnection.SendMessage(BsonBuffer buffer, Int32 requestId)
at MongoDB.Driver.Internal.MongoConnection.SendMessage(MongoRequestMessage message)
at MongoDB.Driver.Operations.CommandOperation`1.Execute(MongoConnection connection)
at MongoDB.Driver.MongoCollection.RunCommandAs[TCommandResult](IMongoCommand command, IBsonSerializer resultSerializer, IBsonSerializationOptions resultSerializationOptions)
at MongoDB.Driver.MongoCollection.RunCommandAs[TCommandResult](IMongoCommand command)
at MongoDB.Driver.MongoCollection.FindAndModify(IMongoQuery query, IMongoSortBy sortBy, IMongoUpdate update, IMongoFields fields, Boolean returnNew, Boolean upsert)
at MongoDB.Driver.MongoCollection.FindAndModify(IMongoQuery query, IMongoSortBy sortBy, IMongoUpdate update, Boolean returnNew, Boolean upsert)
at Sitecore.SessionProvider.MongoDB.MongoSessionStateStore.GetItemExclusive(String application, String id, SessionStateLockCookie lockCookie, Int32& flags)
at Sitecore.SessionProvider.MongoDB.SimpleMongoSessionStateStore.GetItemExclusive(String application, String id, SessionStateLockCookie lockCookie, Int32& flags)
at Sitecore.SessionProvider.MongoDB.MongoSessionStateProvider.GetItemExclusive(HttpContext context, String id, Boolean& locked, TimeSpan& lockAge, Object& lockId, SessionStateActions& actions)
at System.Web.SessionState.SessionStateModule.GetSessionStateItem()
at System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData)
at System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
之前是否有人遇到此问题，任何人都有任何关于在哪里查看的建议/想法？