Up2date, yum and a proxy

[codfather at freenet.co.uk]

I have made all the site changes in yum.conf and up2date for the
change of URL, as listed many times on the list.

I have updated /etc/sysconfig/rhn/up2date with the correct proxy and
entered http_proxy="http://proxy-name:80". I 

When I run 'yum update' command I get the following error,
Gathering header information file(s) from server(s)
Server: Fedora Core 1 - i386 - Base
retrygrab() failed for:
  http://download.fedora.redhat.com/pub/fedora/linux/core/1/i386/os/he
aders/header.info
  Executing failover method
failover: out of servers to try
Error getting file
http://download.fedora.redhat.com/pub/fedora/linux/core/1/i386/os/head
ers/header.info
[Errno 7] HTTP Error (CannotSendRequest):

Any ideas?

Nick