Local SQL*Plus Connection and DBCA Fails With: ORA-12547: TNS:Lost Contact (Doc ID 422173.1)

Last updated on OCTOBER 31, 2016

Applies to:

Oracle Database Configuration Assistant - Version 10.1.0.2 and later
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Oracle Solaris on x86 (32-bit)
HP-UX PA-RISC (64-bit)
Linux x86-64
Linux x86

Symptoms

- Not able to make a local connection.
- Getting the following error when trying to connect using Sql*Plus
ERROR:
----------------
ORA-12547: TNS:lost contact

For example:

$sqlplus / as sysdba

SQL*Plus: Release 11.1.0.7.0 - Production on Wed Mar 30 11:59:06 2011

Copyright (c) 1982, 2008, Oracle. All rights reserved.

ERROR:
ORA-12547: TNS:lost contact

 

Or when attempting to create a new instance through DBCA (Database Configuration Assistant). Having proceeded through all screens and completed the required input, you click the 'Finish' button, then the 'OK' button at the Confirmation screen, but immediately receive a dialogue box containing the following error message:

Cause

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