My Oracle Support Banner

Client Connections Intermittently Fail With ORA-12539 Error in RAC Environment (Doc ID 602879.1)

Last updated on MARCH 31, 2022

Applies to:

Oracle Net Services - Version to [Release 10.1 to 11.1]
Information in this document applies to any platform.
This problem can occur on any platform.


Client connections may fail with ORA-12539 errors in a RAC environment or in an environment where the REMOTE_LISTENER parameter is set in the database.

ORA-12539 TNS:buffer over- or under-flow

Specifically, if the NSPTRD packet size is over 532 bytes, clients may receive the ORA-12539.


This may be a new installation of RAC or the REMOTE_LISTENER parameter has been recently added or changed.


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

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