title: ORA-01017 Invalid Username/Password when connecting to 11g database from 9i client
body: <p>I'm trying to connect to a schema on 11g (v11.2.0.1.0) from a PC with 9i (v9.2.0.1) client. It seems to connect fine to some schemas, but not this one - it comes back with a <code>ORA-01017 Invalid Username/Password</code> error every time.</p>
  
  <p>The username and password are DEFINITELY correct - can anyone think of a reason why this wouldn't work? </p>
  
  <p>Are there any fundamental incompatibilities between 9i and 11g?</p>