Shared Server Issue: TNS-12602: TNS: Connection Pooling limit reached

(Doc ID 466287.1)

Last updated on JUNE 21, 2017

Applies to:

Oracle Net Services - Version 10.1.0.2.0 to 11.1.0.7 [Release 10.1 to 11.1]
Information in this document applies to any platform.

Symptoms

Clients that are configured to make a SHARED (not DEDICATED) connection to the database may
start to fail.  These errors would appear in the listener.log.

TNS-12518: TNS:listener could not hand off client connection
TNS-12564: TNS:connection refused
TNS-12602: TNS: Connection Pooling limit reached

Changes

 No changes necessary.  This is a resource depletion problem.

Cause

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