Handling disconnection of lightstreamer.

[Sathyaayyanar]

When you say "LS was not get started", do you mean that issues may occur during startup or that you may deliberately not restart the Server (or something else, of course)?

It was the another situation, Whenever LS not run on the server, If the users try to login means, intimate the users with alert message. How to resolve this?

[DarioCrivelli]

I confirm that the web client library makes no assumption about the unavailability of the Server and just keeps retrying to connect.
At application level, you can leverage onStatusChange or getStatus and check how long the Engine remains in "CONNECTING" state with your own timer;
if needed, you can switch to "DISCONNECTED" state, then issue an alert.