Unable to Connect to a Listener Using Only Localhost or Loopback IP 127.0.0.1 ORA-12541 or TNS-12541
(Doc ID 279608.1)
Last updated on MARCH 19, 2019
Applies to:Oracle Net Services - Version 184.108.40.206 to 220.127.116.11 [Release 9.2 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 18.104.22.168.0, 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 22.214.171.124.0 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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