PeopleSoft plugin: Oracle error is: "ORA-28040 No matching authentication protocol" error.

Document ID : KB000122477
Last Modified Date : 07/01/2019
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Issue:
We have installed and configured the PeopleSoft plugin and since then the System Agent  no longer starts
Environment:
System Agent release 11.3 SP7

PeopleSoft plugin installed

PeopleSoft database is Oracle 12c

 
Cause:
In the PeopleSoft logs on the Systepm Agent, following exception was found:

"ORA-28040 No matching authentication protocol"

 
Resolution:
Solution found at this URL: 

https://developer.ibm.com/answers/questions/177075/after-upgrading-to-oracle-12c-database-i-start-get/

This issue is reported many times within the community and has been resolved by updating the sqlnet.ora file with these two options: 
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8
SQLNET.ALLOWED_LOGON_VERSION_SERVER=8.

Then restart the Oracle listener (sitting on the Oracle dataserver)