ORA- 28040: No matching Authentication protocol after 12c Upgrade

Issue:

Web application was not working, when connecting through ODBC application team is getting error ORA-28040 .

What Was changed:

Oracle database upgraded from oracle 11.2.0.2 to 12.1.0.2

Resolution/Workaround:

SQLNET.ALLOWED_LOGON_VERSION default is changed to 11 from 8 in earlier versions.  We need to modify the parameter to value 9 or less. SQLNET.ALLOWED_LOGON_VERSION is depreciated in 12c, SQLNET.ALLOWED_LOGON_VERSION_SERVER and SQLNET.ALLOWED_LOGON_VERSION_CLIENT replaced this parameter.

Ref: https://docs.oracle.com/database/121/NETRF/sqlnet.htm#NETRF2016

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