ORA-28040: No Authentication protocol

Question

I am trying to connect to remote DB via simple JDBC but i am getting below

error:
 *** SQLException caught ***
ORA-28040: No matching authentication protocol

code :

import java.sql.*; 
import oracle.jdbc.*;
import java.io.*;
import oracle.jdbc.pool.OracleDataSource;

public class JDBC {

public static void main (String args []) throws SQLException {
    try
    {

       //Connecting to Oracle server
    OracleDataSource ds = new oracle.jdbc.pool.OracleDataSource();
    ds.setURL("jdbc:oracle:thin:@remotehostname:1521:dbname");
    Connection conn = ds.getConnection("my username", "my password");
    System.out.println("Connected to DB");
    }
    catch (SQLException ex) { System.out.println ("\n*** SQLException 
 caught ***\n" + ex.getMessage());}
     catch (Exception e) {System.out.println ("\n*** other Exception  caught ***\n");}
 }
} 

I have added ojdbc6.jar and all supporting jars to build path. I am able to connect to remote via VPN but not via JDBC .. any guidance much appreciated...

Answer 1

From docs.oracle.com If the client version does not meet or exceed the value defined by SQLNET.ALLOWED_LOGON_VERSION_SERVER parameter(sqlnet.ora file), then authentication fails with an ORA-28040: No matching authentication protocol error or an ORA-03134: Connections to this server version are no longer supported error.

You can check your driver version using below command

$java -jar ojdbc6.jar -getversion

Try setting SQLNET.ALLOWED_LOGON_VERSION_SERVER in sqlnet.ora file to lower Oracle version like 8,9 or 10 .

Check this issue for more info.