Oracle JDBC in IS46 on AIX - Database source set up

I am attempting to configure the connection between the IS46 and Oracle 8.1.7 on an AIX 4.3 machine using the Oracle JDBC.

I have configured a thin client connection correctly but would prefer the OCI8 client. I have correctly configured this on a number of other NT machines to get to the DB but cannot get the connection to work on the AIX machine.

I have tried using the tnsnames.ora ie:

as well as the Net8 approach ie:

The AIX machine is where the Oracle db is as well.

Any thoughts would be appreciated. Also does anyone have experiences as to which is the best driver to use?