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Troubleshooting Guide for ORA-12545 / TNS-12545 Connect failed because target host or object does not exist (Doc ID 553328.1)

Last updated on OCTOBER 05, 2019

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Purpose

Aids in explaining, diagnosing and resolving the TNS-12545 error or 'host or object does not exist'.
This is an error that typically occurs when a hostname is not resolveable to Oracle.

Troubleshooting Steps

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In this Document
Purpose
Troubleshooting Steps
 Background of the error
 Scenarios:
 Bequeath / Local Connection
 Remote / TCP Connection
 
RAC / Real Application Cluster
 Listener Startup Fails
 Operating System / Hardware Issues
References

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