ORA-28000: The account is locked. The Connect Descriptor was
While adding the target manually in OEM, the OEM admin user account(sysman) in either target or OEM repository database is locked
Either configure password from OEM itself or use SQLPLUS
Set the passwords
--on target database
SQL> alter user DBSNMP identified by oracle123 account unlock;
User altered.
--on repository
SQL> alter user DBSNMP identified by oracle123 account unlock;
User altered.
Connection is successful after user authentication
