Unable to connect to ATP-D using oracle sql plus

User13401019-Oracle

https://oracle.github.io/learning-library/data-management-library/autonomous-database/dedicated/workshop/index.html?lab=lab-8-configuring-development-system#STEP4:ConnecttoyourautonomousDBusingSQLDeveloperSQLCLandSQLPlus

I am unable to connect to ATP -D using oracle sql plus

[[email protected] ~]$ echo $TNS_ADMIN

/home/opc

[[email protected] ~]$ sqlplus [email protected]_high

SQL*Plus: Release 18.0.0.0.0 - Production on Thu Oct 22 04:40:20 2020

Version 18.5.0.0.0

Copyright (c) 1982, 2018, Oracle. All rights reserved.

Enter password: 

ERROR:

ORA-12699: Native service internal error

Enter user-name: ADMIN

Enter password: 

ERROR:

ORA-12162: TNS:net service name is incorrectly specified

Kay Malcolm-Oracle

Product Manager, Kris B. has been notified.

Kris-Bhanushali-Oracle

Make sure you have network access to DB from client since db is in a private network

set tns_admin variable to folder containing wallet

Make sure wallet file is unzipped and sqlnet.ora has wallet pointing to folder containing unzipped wallet

eg - ....(DIRECTORY="/home/opc")