ORA-12547: TNS:lost contact

[oracle@racnode1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Mon Jan 13 16:31:25 2020

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ERROR:
ORA-12547: TNS:lost contact


Enter user-name:
ERROR:
ORA-12547: TNS:lost contact

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