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  1. #1

    Exclamation NPM Client web SDK disconnect for some reason

    Hi, I started using npm package in my application instead of older version of lightstreamer client we had previously. And now for some reason I inconsistently cannot connect to my lightstreamer server(not always reproducable). I make a connect() call and in browser network I see the call to create_session.txt but in my lightstreamer server logs I see following errors
    Serving request: bind_session -> LS_session=Sbd21b87183da6bdcM7e5T4447660&LS_phase=1903&LS_cause=loop1&
     Received unrecognized session ID: Sbd21b87183da6bdcM7e5T4447660
    Sync error: Unexpected session ID
    And there are no logs of create_session being called. For some reason session is not created properly from this client-web npm package. Can you please help what can be the root cause of the issue and why this keeps happening inconsistently?

  2. #2
    Hello Yana,

    Can you enable the client logger and send the output to

    You can enable the logger by adding the following lines to your application:

    var log = new SimpleLoggerProvider();
    log.addLoggerAppender(new ConsoleAppender("DEBUG", "*"));

    Which server version are you using?

    Are you using a single Lightstreamer server or a cluster behind a load balancer?

    Have you configured a control link address for your Lightstreamer server?


  3. #3
    Hi Alessandro,

    So I was able to resolve the issue thanks to your suggestions. After enabling logger I saw that error was "21 - Wrong session ID". And as you mentioned our server is on load balancer, that is why requests were made to different servers. I fixed it by setting connectionOptions.setCookieHandlingRequired(true) this way my load balancer sticky session is being sent with a request cookies and all requests go to the same server on load balancer.




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