ORA-20000

Cause: The user's account has expired and the password needs to be changed.

Action: Change the password.

SQL> select dba_users.account_status
  2  from   dba_users
  3  where  dba_users.username = 'INFD_T';
 
ACCOUNT_STATUS
--------------------------------
EXPIRED

SQL> ALTER USER INFD_T IDENTIFIED BY INFD_T;
 
User altered
 
SQL> 
SQL> select dba_users.account_status
  2  from   dba_users
  3  where  dba_users.username = 'INFD_T';
 
ACCOUNT_STATUS
--------------------------------
OPEN
 
SQL> 

Other methods:

ALTER USER < USERNAME > IDENTIFIED BY < PASSWORD >;
ALTER USER < USERNAME > IDENTIFIED BY VALUES < PASSWORD_HASH >;