How to Resolve host and listener DNS lookup failures like ORA-12541 an ORA-12545

(Doc ID 743302.1)

Last updated on MAY 03, 2017

Applies to:

APM - Application Performance Management - Version 4.5.1 to [Release 4.5 to 12.1]
Information in this document applies to any platform.


The database used by RUEI depends on the DNS server. When the DNS lookup fails, RUEI is not able to access the database. This often results in errors such as:

ORA-12541: TNS:no listener
ORA-12545: Connect failed because target host or object does not exist

This document shows how one can see if the there is a difference between the local host settings and the DNS settings.
Also when RUEI is implemented in an environment that does not have a DNS server this document provides useful pointers.



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