Alert.log shows ORA-609 with TNS-12537: TNS:connection closed
Last updated on FEBRUARY 21, 2018
Applies to:Oracle Net Services - Version 220.127.116.11 to 18.104.22.168 [Release 11.2]
Oracle Net Services - Version 22.214.171.124 to 126.96.36.199 [Release 12.1]
Oracle Database - Enterprise Edition - Version 188.8.131.52 to 184.108.40.206 [Release 11.2]
Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168 [Release 12.1]
Information in this document applies to any platform.
Alert log shows failed incoming connection:
Changes in database server load, client connect descriptor, changes in network infrastructure (firewall configuration).
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