title: ORA-28040: No matching authentication protocol
body: <p>I am facing this issue even after following the below settings.</p>
  
  <ol>
  <li><p>Replacing <code>ojdbc14.jar</code> with <code>ojdbc6.jar</code>[also tried <code>ojdbc5.jar</code>]</p></li>
  <li><p>Added "<code>SQLNET.ALLOWED_LOGON_VERSION_SERVER=8</code>" to sqlnet.ora
  file[under network/admin folder].</p></li>
  </ol>
  
  <p>This is happening after upgrading the DB from 11g to 12c.</p>