Getting error "java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete"

I am using Thingworx Java edge SDK inside my application, and through my application I am trying to connect to ThingWorx server, but I am getting following exception, any idea about this exception ?

2015-12-17 04:02:39,691 ERROR [Client-EndpointMonitor-1] com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint admin - Refilling connections on [endpoint 0, uri: ws://165.0.0.8:80/Thingworx/WS] failed : timeout waiting for websocket handshake to complete

2015-12-17 04:02:39,693 ERROR [Client-EndpointMonitor-1] com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint admin - Exception refilling connections was:

java.util.concurrent.TimeoutException: timeout waiting for websocket handshake to complete

    at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory$HandshakeCompletionNotifier.await(NettyClientConnectionFactory.java:563)

    at com.thingworx.communications.client.connection.netty.NettyClientConnectionFactory.createConnection(NettyClientConnectionFactory.java:309)

    at com.thingworx.communications.client.endpoints.ClientCommunicationEndpoint.refillConnections(ClientCommunicationEndpoint.java:225)

    at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.dutyCycleOn(ConnectivityMonitorTask.java:150)

    at com.thingworx.communications.common.endpoints.monitor.ConnectivityMonitorTask.run(ConnectivityMonitorTask.java:264)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

    at java.lang.Thread.run(Thread.java:745)

Thanks!

Meghana