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websocket error
io.socket.engineio.client.EngineIOException: xhr poll error at io.socket.engineio.client.Transport.onError(Transport.java:64) at io.socket.engineio.client.transports.PollingXHR.access$100(PollingXHR.java:18) at io.socket.engineio.client.transports.PollingXHR$6$1.run(PollingXHR.java:126) at io.socket.thread.EventThread$2.run(EventThread.java:75) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)Caused by: java.net.UnknownHostException: console.gridgain.com at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1890) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1885) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1884) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1457) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441) at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338) at io.socket.engineio.client.transports.PollingXHR$Request$1.run(PollingXHR.java:214) ... 1 more