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 JANUARY 17, 2025
Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 to 12.2.0.1 [Release 12.2]Oracle Net Services - Version 11.2.0.4 and later
Oracle Database - Enterprise Edition - Version 19.9.2.0.0 and later
Gen 2 Exadata Cloud at Customer - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A 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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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |