you are going to have many unsolvable problems with RHEL 4.3
the entire 4 series is unsupported ,and has been unsupported for some time .
and the current is RHEL 6.5
do you have a gui installed or is the CUPS web interface accessible
http://localhost:631/
port 631 is the cups interface
is the printer set up
mind you not even redhat still supports rhel4