Qlik View 12 SR8 - No Server error in Access point

[athirabose]

Error log from web_server_log : Error QVClient.ExecuteWithAttachments failed. Exception=System.Exception: The communication with QlikView Server failed (TimedOut)! ||    at QlikTech.NetClient.QvClient.GetMessageDataFromSocket(Byte[] buffer) ||    at QlikTech.NetClient.QvClient.GetMessageSizeFromSocket() ||    at QlikTech.NetClient.QvClient.SendAndReceive(Byte[] request) ||    at QlikTech.NetClient.QvClient.Execute(Byte[] request) ||    at QlikTech.NetClient.QvClient.ExecuteWithAttachments(String request, Byte[][] attachments) ||    at QVSWrapper.QlikViewServer.ExecuteWithAttachments(Action`2 i_Logger, String i_Command, Byte[][] i_Attachments)

20180509T105204.115+0000 Error System.Exception: No data was returned from the QlikView Server. QVSMessageLength=null ||    at QVSWrapper.QlikViewServer.GetDocumentThumbNail(Action`2 i_Logger, String Path) ||    at QlikView.AccessPoint.QlikviewServerSetting.Try(Func`2 f, Func`1 fail) ||    at QlikView.AccessPoint.AccessPointHandler.ExecuteBinary(AccessPointContext context, String id) ||    at QvIISWebServer.AccessPoint.Page_Load(Object sender, EventArgs e)

Performance Log :

Performance log attached during the same time.

[Miguel_Angel_Baeyens]

It's always a good starting point when asking for help to provide some context on your deployment, how your services are set up, which things have you already tried, whether or not this happens every time, etc. instead of throwing a cold log without any further explanation.