[06/27/19 03:46:52] [SSH] SSH host key matches key in Known Hosts file. Connection will be allowed.
[06/27/19 03:46:52] [SSH] Authentication successful.
ERROR: null
java.util.concurrent.CancellationException
 at java.util.concurrent.FutureTask.report(FutureTask.java:121)
 at java.util.concurrent.FutureTask.get(FutureTask.java:192)
 at hudson.plugins.sshslaves.SSHLauncher.launch(SSHLauncher.java:902)
 at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:294)
 at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
 at jenkins.security.ImpersonatingExecutorService$2.call(ImpersonatingExecutorService.java:71)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
[06/27/19 03:50:21] Launch failed - cleaning up connection
[06/27/19 03:50:21] [SSH] Connection closed.