Intermittent Connection Error - "Wrong Session ID" - .net standard client

mdb79

Hi,

I am experiencing intermittent issues connecting to the lightstreamer server with the below code.

I am using the Lighstreamer.DotNetStandard.Client v5.1.0. If I keep trying to connect I will eventually succeed but this can sometimes take 5 or 6 attempts.

The closest post I could find relating to this mentioned setCookieHandlingRequired which isn't available in the .net standard from what I could see.

public void Connect()
        {
            //http://blog.lightstreamer.com/2020/02/new-lightstreamer-net-standard-client.html


            LightstreamerClient client = new LightstreamerClient(PushServerURL, Adapter);
            client.connectionDetails.User = Username;
            client.connectionDetails.Password = Password;
            
            MyClientListener cl = new MyClientListener();
            cl.ServerErrorReceived += Cl_ServerErrorReceived;
            cl.StatusUpdateReceived += Cl_StatusUpdateReceived;


            client.addListener(cl);


            Subscription sub = new Subscription("DISTINCT");
            sub.DataAdapter = DataAdapter;
            sub.ItemGroup = Group;
            sub.FieldSchema = Schema;
            sub.RequestedMaxFrequency = sub_max_freq + ""; //set to 1.0   
            QuestionConnectionListener ql = new QuestionConnectionListener();
            ql.QuestionUpdateReceived += Wrapper_QuestionUpdateReceived;
            
            sub.addListener(ql);


            client.connect();            
            client.subscribe(sub);
        }

I see this in the output for each failure...

ClientListener.onListenStart
QuestionConnectionListener Instantiated...
OnListenStart...
ClientListener.onPropertyChange:sessionId
SessionID:
ClientListener.onPropertyChange:serverSocketName
ClientListener.onPropertyChange:clientIp
ClientListener.onPropertyChange:serverInstanceAddress
ClientListener.onPropertyChange:realMaxBandwidth
CONNECTING
ClientListener.onStatusChange. Status=CONNECTING
ClientListener.onPropertyChange:sessionId
SessionID:S1d8f9cca8da82d06M381T0016607
ClientListener.onPropertyChange:serverInstanceAddress
CONNECTED:STREAM-SENSING
ClientListener.onStatusChange. Status=CONNECTED:STREAM-SENSING
ClientListener.onPropertyChange:serverSocketName
ClientListener.onPropertyChange:clientIp
ClientListener.onPropertyChange:realMaxBandwidth
ClientListener.OnServerError. Error=Wrong session ID
ClientListener.onPropertyChange:sessionId
SessionID:
ClientListener.onPropertyChange:serverSocketName
ClientListener.onPropertyChange:clientIp
ClientListener.onPropertyChange:serverInstanceAddress
ClientListener.onPropertyChange:realMaxBandwidth
DISCONNECTED
ClientListener.onStatusChange. Status=DISCONNECTED
ClientListener.OnServerError. Error=Wrong session ID

On success I see...

QuestionConnectionListener Instantiated...
ClientListener.onListenStart
OnListenStart...
ClientListener.onPropertyChange:sessionId
SessionID:
ClientListener.onPropertyChange:serverSocketName
ClientListener.onPropertyChange:clientIp
ClientListener.onPropertyChange:serverInstanceAddress
ClientListener.onPropertyChange:realMaxBandwidth
CONNECTING
ClientListener.onStatusChange. Status=CONNECTING
ClientListener.onPropertyChange:sessionId
SessionID:S90518d396f547b59M116T5849226
ClientListener.onPropertyChange:serverInstanceAddress
CONNECTED:STREAM-SENSING
ClientListener.onStatusChange. Status=CONNECTED:STREAM-SENSING
ClientListener.onPropertyChange:serverSocketName
ClientListener.onPropertyChange:clientIp
ClientListener.onPropertyChange:realMaxBandwidth
ClientListener.onPropertyChange:keepaliveInterval
ClientListener.onPropertyChange:realMaxBandwidth
CONNECTED:HTTP-STREAMING
ClientListener.onStatusChange. Status=CONNECTED:HTTP-STREAMING
Start subscription.
Real frequency: 1.0.
End of Snapshot for .

Giuseppe Corti

Hi mdb79,

I can confirm that the setCookieHandlingRequired method is only present in the Web API, for other libraries such as .NET the management of cookies is automatic and does not require to be explicitly activated.
So, please could you confirm that your client is targetting a cluster of Lightstreamer servers with a Load Blancer leveraging a cookie based Stickiness?

Regards,
Giuseppe