1.Redhat 4.3 上安裝oracle10G.
2.NetWorker Server 8.2.1 , NetWorker Client 8.0.3 , NMDA 1.2
Kindly , Check whether you are using the right authentication while running the Oracle backup as mentioned in the networker admin guide available in the EMC support site.
Please let me know if you have any further query.
With NMDA 1.2 you had to use patch in case RMAN script didn't had connect string if I remember correctly (I believe NW140995 or something like that).