sqlplus / as sysdba ORA-01017: invalid username/password; logon denied

ORA-01017: invalid username/password; logon denied.. 

oracle@generic ~]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Sun Nov 20 07:08:07 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

ERROR:

ORA-01017: invalid username/password; logon denied

[oracle@generic ~]$ echo $TWO_TASK

ORCL

Unset this variable TWO_TASK  <<<<<<<<<<<<<<<<

[oracle@generic ~]$ unset TWO_TASK

[oracle@generic ~]$ echo $TWO_TASKS

[oracle@generic ~]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Sun Nov 20 07:20:15 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Connected to:

Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production

With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> 

===========

[oracle@localhost ~]$ ps -ef|grep -i smon

oracle      1970       1  0 05:00 ?        00:00:00 db_smon_FREE

oracle      6247    6193  0 06:26 pts/2    00:00:00 grep --color=auto -i smon

[oracle@localhost ~]$ . oraenv

ORACLE_SID = [FREE] ?

The Oracle base remains unchanged with value /opt/oracle

[oracle@localhost ~]$ sqlplus / as sysdba

SQL*Plus: Release 23.0.0.0.0 - Developer-Release on Sun Sep 10 06:26:33 2023

Version 23.2.0.0.0

Copyright (c) 1982, 2023, Oracle.  All rights reserved.

ERROR:

ORA-01017: invalid credential or not authorized; logon denied

[oracle@localhost ~]$ echo $TWO_TASK

FREEPDB1

[oracle@localhost ~]$ unset TWO_TASK  ---- unset 

[oracle@localhost ~]$ sqlplus / as sysdba

SQL*Plus: Release 23.0.0.0.0 - Developer-Release on Sun Sep 10 06:28:14 2023

Version 23.2.0.0.0

Copyright (c) 1982, 2023, Oracle.  All rights reserved.

Connected to:

Oracle Database 23c Free, Release 23.0.0.0.0 - Developer-Release

Version 23.2.0.0.0

SQL>

====

connect to user 

 sqlplus hr/hr@//192.168.0.70:1521/freepdb1

SQL*Plus: Release 23.0.0.0.0 - Production on Tue Nov 7 11:46:00 2023

Version 23.3.0.23.09

Copyright (c) 1982, 2023, Oracle.  All rights reserved.

Last Successful login time: Wed Sep 13 2023 19:50:31 +00:00

Connected to:

Oracle Database 23c Free Release 23.0.0.0.0 - Develop, Learn, and Run for Free

Version 23.3.0.23.09

SQL> def

DEFINE _DATE           = "07-NOV-23" (CHAR)

DEFINE _CONNECT_IDENTIFIER = "//192.168.0.70:1521/freepdb1" (CHAR)    <<<<<<<<<<<<---

DEFINE _USER           = "HR" (CHAR)

DEFINE _PRIVILEGE      = "" (CHAR)

DEFINE _SQLPLUS_RELEASE = "2303002309" (CHAR)

DEFINE _EDITOR         = "vi" (CHAR)

DEFINE _O_VERSION      = "Oracle Database 23c Free Release 23.0.0.0.0 - Develop, Learn, and Run for Free

Version 23.3.0.23.09" (CHAR)

DEFINE _O_RELEASE      = "2303002309" (CHAR)

SQL>

SQL> show user

USER is "HR"

SQL>