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Remote Connections intermittently fail with ORA/TNS-12537. TNS-12518 reported in Listener log. "Imperva" auditing tool in use. (Doc ID 2397319.1)

Last updated on MAY 10, 2018

Applies to:

Oracle Net Services - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

Intermittent connection issues:

Client -->
ORA-12537 or TNS-12537 with connections

Listener -->
Listener log reports:

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

Changes

There may have been an introduction of (or changes to) the "Imperva" software (3rd party program usually used for Auditing or Security).

Cause

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