10.3 Enterprise Manager (EM) installer fails to connect to Oracle 12.2 database with message:
ORA-28040: No matching authentication protocol
To be compatible with both Oracle 11g and 12c the EM installer and the EM itself use the Oracle 11g JDBC driver file ojdbc6.jar. That driver is using an Oracle 11 auth type connection to the Oracle database.
Adding this line to the Oracle Database Server sqlnet.ora file will allow the Oracle 11 auth type connection to the Oracle 12c database:
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