My Oracle Support Banner

Shared Server Issue: TNS-12602: TNS: Connection Pooling limit reached (Doc ID 466287.1)

Last updated on APRIL 19, 2023

Applies to:

Oracle Net Services - Version 10.1.0.2.0 and later
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

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document
Symptoms
Changes
Cause
Solution
References

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.