I'm trying to use the ATrpms repo with yum in SLF3.08. When I try, as root, "yum -c /etc/yum.conf.atrpms list" it gives the following error:

Server: ATrpms rpms
retrygrab() failed for:
  ftp://ftp.scientificlinux.org/linux/extra/atrpms/sl3-i386/stable/headers/header.info
  Executing failover method
failover: out of servers to try
Error getting file ftp://ftp.scientificlinux.org/linux/extra/atrpms/sl3-i386/stable/headers/header.info
[Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.


I haven't found an answer to this yet and I really need some packages from this repo. Can anyone tell me how to fix this?
Thanks,
Jack