Client Connections Intermittently Fail With ORA-12539 Error in RAC Environment

(Doc ID 602879.1)

Last updated on OCTOBER 27, 2016

Applies to:

Oracle Net Services - Version: to
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.


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