Alert.log shows ORA-609 with TNS-12537: TNS:connection closed (Doc ID 1538717.1)

Last updated on APRIL 17, 2017

Applies to:

Oracle Net Services - Version 11.2.0.1 to 11.2.0.4 [Release 11.2]
Oracle Net Services - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.

Symptoms

Alert log shows failed incoming connection:

 

Changes

Changes in database server load, client connect descriptor, changes in network infrastructure (firewall configuration).

Cause

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