FirewallBuilder

"I/O Error" while compiling policy. There is no other indication of error though.

Did you install package with corresponding compiler? Our pre-built compilers come in a separate RPMs named like this: fw builder-ipt-2.0.2-1rh9.i386.rpm

Check if compiler dumped core. If you can't find it, you may try to run compiler manually, providing the following command-line parameters:

$ fwb_ipt -f path_to_objects.xml firewall_object_name

All policy compilers have the same command line format.