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 faced the same error.

Got it resolved by without removing ojdbc14.jar.

step 1 : set SQLNET.ALLOWED_LOGON_VERSION=8

Step 2 : change

Connection conn = (Connection) DriverManager.getConnection("jdbc:oracle:thin:@server:port:sid", "username", "passwrd");

to

java.sql.Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@@server:port:sid", "username", "passwrd");

It will works!