Please restart the sshd service in each node and try to ssh login from namenode to each node.


1) To restart sshd service :


sudo service sshd restart


2) For ssh login to other node from namenode:


ssh hostname_of_destination_node


or,


ssh ip_of_destination_node


I think this will resolve the query.


Please let me know if the issue still persists.


Feel free to contact us in case you have any other query.