Referred to below two pages, to confirm they are same problem & solution.
https://community.oracle.com/thread/383358?start=0&tstart=0
https://dba010.wordpress.com/2011/07/18/error-connection-to-host-as-user-oracle-failed-error-nmo-not-setuid-root-unix-only/
My problem solved after ask system administrator to help run the root.sh too.
