Hello,
As I told still doing testing with the web sockets. It seems that a reconnection doesn't fully work. I don't know why. If the connection is the first the browser does. It works nice. The server sends a message to the client (browser) and the browser responds with a request for data. That works nicely. But when I reload the page, most of times doesn't work. 2017-03-08 18:19:14,117 [http-bio-8080-exec-29] DEBUG com.level2.dashboard.web.component.websocket.MessengerWebSocketResource - Connected application com.level2.dashboard.PandoraApplicationImpl@49b8641c with session id AAD6510DE8CA72C6CE7FF1FD4F1CF03D 2017-03-08 18:19:14,117 [http-bio-8080-exec-29] WARN com.level2.dashboard.web.component.websocket.WebSocketClientManagerImpl - The client a13f637ea458fb61807e65429a9c18e3f5e8dd46cbe2d46cd1cc0894b4abb2f is already connected, resending id The server receives a connection. And in response it sends a message to the client with a client ID. The client should respond. but it seems browser never receives the message. Why it doesn't work? Can connection be dropped or messages lost? I added some logs to see if the socket is closed but it's ok. @Override public boolean sendMessage(ConnectionIdentifier identifier, String message) { Application application = Application.get(identifier.getApplicationName()); IWebSocketSettings webSocketSettings = IWebSocketSettings.Holder.get(application); IWebSocketConnectionRegistry webSocketConnectionRegistry = webSocketSettings.getConnectionRegistry(); IWebSocketConnection connection = webSocketConnectionRegistry.getConnection(application, identifier.getSessionId(), identifier.getKey()); if (connection == null || !connection.isOpen()) { log.warn("Connection is closed!!!"); return false; } try { connection.sendMessage(message); } catch (IOException e) { log.warn("Cannot send message: {}", e.getMessage()); return false; } return true; } So Why I cannot send it. Or why the client is not receiving it? Best regards,