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 188.8.131.52 and later
Information in this document applies to any platform.
Intermittent connection issues:
ORA-12537 or TNS-12537 with connections
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
There may have been an introduction of (or changes to) the "Imperva" software (3rd party program usually used for Auditing or Security).
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