Trying to run hdfs fetch image command

hdfs dfsadmin -fetchImage /tmp/.

16/09/01 10:09:37 INFO namenode.TransferFsImage: Opening connection to http://xxx:50070/imagetransfer?getimage=1&txid=latest

16/09/01 10:09:37 INFO namenode.TransferFsImage: Image Transfer timeout configured to 60000 milliseconds

fetchImage: Connection refused

I am getting connection refused.

Please advice. Do I need anyconfiguration on Isilon side