ORA-12560 Error when Connecting to SQLPLUS as ROOT (Doc ID 339509.1)

Last updated on JUNE 15, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 11-Jan-2016***

Symptoms

As root user id when trying to connect to a database using bequeath protocol, get TNS-12560 protocol adapter error.  This error is received even though connecting as a regular user and not as sysdba.  Other users are not experiencing the error.

ORACLE_SID, ORACLE_HOME are all set properly

Cannot connect locally
sqlplus <username>/<password>

ORA-12560: TNS:proto adapter error

Cause

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