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 FEBRUARY 12, 2020
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [Release 12.2]
Oracle Net Services - Version 18.104.22.168 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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