Unable to Connect to a Listener Using Only Localhost: ORA-12541 or TNS-12541
Last updated on SEPTEMBER 06, 2017
Applies to:Oracle Net Services - Version 10.2.0.1 to 188.8.131.52 [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.
Beginning with listener version 184.108.40.206.0, 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 220.127.116.11.0 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
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