Hi avinashghodke,

The message reported means that a websocket close was called before the connection was even given a chance to be established.
This can happen when the JavaScript library determines that has been too long in an attempt to connect; so it gives up and tries some fallbacks (HTTP streaming, polling, ...).

Please could you confirm that despite the error message then the connection eventually succeds?
The most likely reason for the failure of websocket is that between the server and the client there is some intermediary (such as a proxy) that does not support WS protocol, and prevent the client request to reach the Lightstreamer server.

Regards,
Giuseppe