Hi! I have this situation :
Could not retrieve mirrorlist
ftp://ftp.scientificlinux.org/linux/scientific/mirrorlist/sl-base-53.txt
error was
[Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.
http://ftp.scientificlinux.org/linux/scientific/53/x86_64/SL/repodata/repomd.xml:
[Errno 14] HTTP Error 403: Forbidden
Trying other mirror.
sl-base
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Could not retrieve mirrorlist
ftp://ftp.scientificlinux.org/linux/scientific/mirrorlist/sl-security-53.txt
error was
[Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.
http://ftp.scientificlinux.org/linux/scientific/53/x86_64/updates/security/repodata/repomd.xml:
[Errno 14] HTTP Error 403: Forbidden
Trying other mirror.

any idea about this?
Thanks!
Adrian