SQLPlus Local Login on the Database (DB) Host Fails with "ORA-01017: invalid username/password; logo

DB VERSION:19.3

OS VERSION:Red Hat Enterprise Linux Server release 7.4 (Maipo)

When I create a new account in pdb,and try login the pdb,then an error occured.

15:51:21 sys@ora19c.PDBTEST > create user u01 identified by 123;

User created.

Elapsed: 00:00:00.03

15:51:54 sys@ora19c.PDBTEST > grant connect,resource to u01;

Grant succeeded.

Elapsed: 00:00:00.00

15:52:05 sys@ora19c.PDBTEST > select username,account_status from dba_users where username='U01';

USERNAME       ACCOUNT_STATUS

-------------------- --------------------------------

U01         OPEN

1 row selected.

Elapsed: 00:00:00.01

15:52:35 sys@ora19c.PDBTEST > conn u01

Enter password:

ERROR:

ORA-01017: invalid username/password; logon denied

Warning: You are no longer connected to ORACLE.