ORA-28040: No matching authentication protocol : Oracle 12c Upgrade

Question

We have migrated our Oracle database to 12c from 11g. We have a legacy application running in Java 1.5 and using ojdbc14.jar.

Our application is not able to create c

Answer 1

I was getting ORA-28040 in Sqldeveloper (ver. 1.5.5) for all connections. I set SQLNET.ALLOWED_LOGON_VERSION=8 but the error didn't go away. Then I enabled "Use OCI/Thick driver" under Tools->Preferences->Database->Advanced Parameters. That did the trick.