title: Connecting to Oracle19C Server using Oracle11g client
body: <p>all</p>
  <p>I'm trying to connect to an Oracle 19C database. I have installed two Oracle Clients (11g and 12c) because we need to support legacy programs. I can connect with no issue with any user using sqlplus through the 12c client. But if I use the 11g (11.2.0) client with any user. I always get:</p>
  <pre><code>ERROR:
  ORA-01017: invalid username/password; logon denied
  </code></pre>
  <p>Both clients have exactly the same sqlnet.ora and tnsnames.ora files, so both clients point to the same database.</p>
  <p>Any idea? Do I need to set some specific configuration in the 19c server? Or do I need to make some change in the 11g client? Is this even possible?</p>
  <p>Thank you.</p>