Connection closed before receiving a handshake response

Hi,
We are getting below error in some browsers(chrome or mozilla) when we connect mqtt using web sockets. When we clear browser history then connected.
Error:
WebSocket connection to 'wss://host:port/mqtt' failed: Connection closed before receiving a handshake response Paho.MQTT.ClientImpl._doConnect @ mqttws31.js:979

My connection:

var client = new Paho.MQTT.Client("host", Number(port), "myClientId" + new Date().getTime());
client.connect({userName:username,password:password,onSuccess:onConnect,onFailure:doFail,useSSL:true,cleanSession:false});

So please look into this.
Thanks