Cause: connect sys/<password> is
no longer a valid syntax
Action: Try connect sys/<password>
as sysdba or connect sys/<password> as sysoper

Relared Errors:
ORA-28010:
cannot expire external or global accounts
ORA-28011: the
account will expire soon; change your password now
ORA-28012:
Manual commit not allowed here
ORA-28020:
IDENTIFIED GLOBALLY already specified
ORA-28021:
cannot grant global roles
ORA-28022:
cannot grant external roles to global user or role
ORA-28023: must
revoke grants of this role to other user(s) first
ORA-28024: must
revoke grants of external roles to this role/user
ORA-28025:
missing or null external name
ORA-28026: user
with same external name already exists