New Connections to the Database lead to ORA-12518 or TNS-12518

(Doc ID 340089.1)

Last updated on AUGUST 23, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.3 [Release 11.2]
Oracle Net Services - Version 9.2.0.8 to 11.2.0.4 [Release 9.2 to 11.2]
Oracle Database - Enterprise Edition - Version 11.2.0.2 to 11.2.0.2 [Release 11.2]
Information in this document applies to any platform.
***Checked for relevance on 1-OCT-2014***
Database may be configured as DEDICATED or Shared Server (MTS).




Symptoms

* ORA-12518 errors in the listener log when new users are connecting to the Database. Example is as follows:

TNS-12518: TNS:listener could not hand off client connection
  TNS-12547: TNS:lost contact
   TNS-12560: TNS:protocol adapter error
    TNS-00517: Lost contact
     IBM/AIX RISC System/6000 Error: 32: Broken pipe



This is an intermittent problem that would likely occur at peak database usage times.

Cause

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