[Fedora-it] Problemi con YUM

[Sasa]

Ciao a tutti,
ho un problema con YUM su Fedora Core 6, in particolare ho il seguente 
errore:

[root a mail ~]# yum update 
Loading "installonlyn" plugin
Repository extras is listed more than once in the configuration
Setting up Update Process
Setting up repositories
Could not retrieve mirrorlist 
http://fedora.redhat.com/download/mirrors/fedora-core-6 error was
[Errno 14] HTTP Error 404: Date: Tue, 09 Jun 2009 12:08:22 GMT
Server: Apache/2.2.3 (Red Hat)
Content-Length: 317
Content-Type: text/html; charset=iso-8859-1
Error: Cannot find a valid baseurl for repo: core

il file di configurazione yum.conf è:

[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
metadata_expire=1800

mentre il file fedora-core.repo contiene:

[core]
name=Fedora Core $releasever - $basearch
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$basearch/os/
mirrorlist=http://fedora.redhat.com/download/mirrors/fedora-core-$releasever
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora 
file:///etc/pki/rpm-gpg/RPM-GPG-KEY

[core-debuginfo]
name=Fedora Core $releasever - $basearch - Debug
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$basearch/debug/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora 
file:///etc/pki/rpm-gpg/RPM-GPG-KEY

[core-source]
name=Fedora Core $releasever - Source
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/source/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora 
file:///etc/pki/rpm-gpg/RPM-GPG-KEY

..come posso risolvere ?
Grazie.

------

   Salvatore.