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TCP.VALIDNODE_CHECKING and TCP.INVITED_NODES With Oracle's Data Guard? (Doc ID 1968655.1)

Last updated on MAY 01, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


This document explains how the sqlnet.ora file settings for TCP.VALIDNODE_CHECKING and TCP.INVITED_NODES work with Oracle's Data Guard

Adding only the standby database to the TCP.INVITED_NODES parameter on the standby does not impact the operation of Oracle's Data Guard product. I can not TNSping the standby from the primary, I can not connect via telnet to port 1521 nor can I log onto the standby via SQL*Plus from the primary. These attempts get ORA-12537.  Expected Data Guard connections to fail since the hosts are not in the access list.



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