Unable to Connect to a Listener Using Only Localhost: ORA-12541 or TNS-12541 (Doc ID 279608.1)

Last updated on NOVEMBER 13, 2013

Applies to:

Oracle Net Services - Version 10.2.0.1 to 12.1.0.1 [Release 10.2 to 12.1]
Information in this document applies to any platform.
This problem can occur on any platform.
Remote clients attempting to connect to a database via a listener started up on localhost.

Symptoms

Beginning with listener version 9.2.0.5.0, remote clients attempting to connect to a database via a listener started up on localhost will encounter the error ORA-12541 - no listener. Tnsping also fails with the same error.

If a 9.2.0.4.0 or older version of listener is used, and started up on localhost, remote users are able to connect via that listener as well as tnsping

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms