The Solution
To resolve this error, you must increase the values for INBOUND_ CONNECT_ TIMEOUT on both the listener side and the server side. If you are getting ORA-609 because of a connection timeout issue, increasing the values should fix the problem. You should change INBOUND_ CONNECT_ TIMEOUT to read as the following:
Sqlnet.ora: SQLNET.INBOUND_CONNECT_TIMEOUT=180
Listener.ora: INBOUND_CONNECT_TIMEOUT_listener_name=120
Above, the timeout seconds are being set to 120 in place of the default 60. While this simple change should fix most ORA-609 errors, if you continue to see this error then you should try to locate which client is causing the error. Set the sqlnet.ora file parameter to
sqlnet.ora file: DIAG_ADR_ENABLED = OFF
Putain je me suis pris la tête avec mon client pour cette erreur à la con!!!
https://www.tekstream.com/resource-center/ora-609-opiodr-aborting-process-unknown-ospid/