How to solve the problem with opening SERVICE_NAME?

Question

linux

Hello.
Did my first install of Oracle 12.2.0.1 today under linux CeontOS 7
installation went fine with no errors
BUT there was a problem: listener persists in connecting db instance (TNSNAME not allowed)
checking status shows the following

[[email protected] ~]$ lsnrctl status

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 09-AUG-2017 12:51:47

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.0.32)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.2.0.1.0 - Production
Start Date                09-AUG-2017 12:51:29
Uptime                    0 days 0 hr. 0 min. 17 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /app/oracle/product/12.2.0/db_1/network/admin/listener.ora
Listener Log File         /app/oracle/diag/tnslsnr/dboracle01/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.32)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

Connecting to the database locally from under sql plus goes fine

SQL> select sysdate from dual
  2  ;

SYSDATE
--------
09.08.17

listener.ora text

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = /app/oracle/product/12.2.0/db_1)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
#    (DESCRIPTION =
#      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
#      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
#    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.32)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

and sqlnet.ora
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
Restart through the stop of the listener, the database, and the launch of the listener's database did not help.
What could be the problem and how to solve it?

Answer 1

the problem was that in the db the service_name was in lowercase
SQL> show parameter service_names
NAME TYPE VALUE
----------------------- ------- -----------------------------------------
service_names string dboracle