ORA-12547: TNS:lost contact

Hi DBA Gurus,

While creating a database using dbca, I got this error but I somehow managed to create the database .

Now, When connecting to the database using sqlplus I get the same error. Kindly suggest to fix this issue.

-bash-4.2$ sqlplus /nolog

SQL*Plus: Release 12.1.0.1.0 Production on Thu May 20 08:39:20 2021

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

SQL> conn / as sysdba

ERROR:

ORA-12547: TNS:lost contact

SQL>

DB Version -- Oracle 12.1.0.1

OS -- Linux 7.5

Env --On my personal laptop

Regards,

Balaji