When configuring an Oracle instance in Data Protector and the following occurs :
ORA-01017: invalid username/password; logon denied
please try and check the full connection string with sqlplus as the same user/group on the system where the configuration is running. Also, please use the "as sysdba" as this is required in Data Protector. An example would be :
sqlplus /nolog
connect Oracleuser/password@ORASID1 as sysdba