If you are trying to setup an Oracle instance for running OWB then you will need to set the remote_login_passwordfile to EXCLUSIVE in order for that to work. Using SQLPLUS connect to the instance and change the setting like this:
> sqlplus /nolog
SQL> connect / as sysdba
SQL> alter system set remote_login_passwordfile=EXCLUSIVE scope=spfile;
that should do the trick although you will need to bounce the instance before it will take effect.
You may also need to re-generate the sys password file like this:
SQL> orapwd file=orapwinst password=pwd123 force=y
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