Oracle Error Message
DGM-16979: Unable to log on to the primary or standby database as SYSDBA
Reason for the Error
The username/password used by the observer to log on to the primary database and Fast-Start Failover target standby database does not have valid SYSDBA credentials.
Solution
Make sure the primary database and Fast-start failover target database are using a remote login password file. Make sure the SYSDBA password is the same at both databases and that the SYSDBA password is used in the CONNECT command. Start the observer again.