Local SQL*Plus Connection and DBCA Fails With: ORA-12547: TNS:Lost Contact

(Doc ID 422173.1)

Last updated on APRIL 02, 2018

Applies to:

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


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

For example:

$sqlplus / as sysdba

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

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

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:


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