the red hat ftp is working fine for me, sometimes it is best to pick individual ftp sites, here are the list for all three cd's:
cd 1 : http://linuxiso.org/viewmirrors.php/464
cd 2 : http://linuxiso.org/viewmirrors.php/465
cd 3 : http://linuxiso.org/viewmirrors.php/466
these worked fine for me, I just tested them, linuxiso.org was down earlier today but it has been fixed now.
I don't mean to be pushy about rh 9, trust me, I just changed recently, I was hell bent on keeping 7.3, but the packages just caught up to me and I felt like I had to upgrade. The best would be red hat 7.3 with all updated packages, but you can't always get what you want.