TNS-12518 with connections to 12c Database using the 12c Listener (Doc ID 1989707.1)

Last updated on APRIL 10, 2017

Applies to:

Oracle Net Services - Version 12.1.0.1 and later
Information in this document applies to any platform.

Symptoms

When making a connection to the 12c Database via the 12c Listener, this may fail persistently (all the time) with TNS-12518

Changes

 This may be a new installation or there may have been changes made to the Listener.ora file (specifically, the SID_LIST section)

Cause

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