Error "ORA-28040: No matching authentication protocol" After database upgrade to 12c
(Doc ID 755605.1)
Last updated on SEPTEMBER 18, 2020
Applies to:Oracle Net Services - Version 18.104.22.168 to 22.214.171.124 [Release 12.2]
JDBC - Version 10.1.0 to 10.2.0.5
Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 12.1]
Information in this document applies to any platform.
When using the property "SQLNET.ALLOWED_LOGON_VERSION=10" set in the file sqlnet.ora on the server side, a 10g JDBC thin driver connecting to this 10g oracle database, fails with following errors:
The Network Adapter could not establish the connection
ORA-28040: No matching authentication protocol
Database upgrade to latest version, or configuring SQLNET.ORA on the server side.
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