The question was mainly about the (not working) ErrorDocument, i.e.,
httpd configuration.
OTOH it's interesting:
http://download.fedora.redhat.com/pub/fedora/linux/releases/11/ - no
problem ("no permission" only).
http://download.fedora.redhat.com/pub/fedora/linux/releases/11/Fedora/ -
"Additionally, a 403 Forbidden error was encountered while trying to
use an ErrorDocument to handle the request."
--
Krzysztof Halasa