Error "ORA-28040: No matching authentication protocol" After Database Upgrade to 12c
(Doc ID 755605.1)
Last updated on JULY 26, 2022
Applies to:Oracle Net Services - Version 220.127.116.11 to 18.104.22.168 [Release 12.2]
JDBC - Version 10.1.0 to 10.2.0.5
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 12.1]
Oracle WebLogic Server - Version 188.8.131.52.0 to 184.108.40.206.0 [Release 12c]
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.
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document