"In exclusive mode, accounts which oly have the 10G password version (see DBA_USERS.PASSWORD_VERSIONS)" ...
There is one account RMAN somehow is having 10G version password.
SQL> select username, password_versions from dba_users where username='RMAN';
USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G
although the parameter sensitive is already true, set the minimum allowed version in sqlnet.ora (SQLNET.ALLOWD_LOGON_VERSION_SERVER) to 10. but still not worked for me.
Finally, solution worked for me is to change its password manually.
SQL> password
Changing password for RMAN
Old password:
New password:
Retype new password:
Password changed
SQL> select username, password_versions from dba_users where username='RMAN';
USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G 11G 12C
SQL> password
Changing password for RMAN
Old password:
New password:
Retype new password:
Password changed
SQL> select username, password_versions from dba_users where username='RMAN';
USERNAME
--------------------------------------------------------------------------------
PASSWORD_VER
------------
RMAN
10G 11G 12C
