[root@hades ~]# yum -y update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.cs.wisc.edu
 * updates: ftp.ussg.iu.edu
 * addons: centos-distro.cavecreek.net
 * extras: centos-distro.cavecreek.net
AL-Server                                                |  951 B     00:00
primary.xml.gz                                           | 248 kB     00:04
AL-Server                                                      750/750
http://centos.cs.wisc.edu/pub/mirrors/linux/centos/5.5/os/i386/repodata/repomd.x
ml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
http://centos.mirror.seiri.com/5.5/os/i386/repodata/repomd.xml: [Errno 4] IOErro
r: <urlopen error (111, 'Conexi\xc3\xb3n rehusada')>
Trying other mirror.
http://linux.mirrors.es.net/centos/5.5/os/i386/repodata/repomd.xml: [Errno 14] H
TTP Error 404: Not Found
Trying other mirror.
http://mirror.hosef.org/centos/5.5/os/i386/repodata/repomd.xml: [Errno 14] HTTP
Error 404: Not Found
Trying other mirror.
http://mirror.nexcess.net/CentOS/5.5/os/i386/repodata/repomd.xml: [Errno 14] HTT
P Error 404: Not Found
Trying other mirror.
http://mirror.trouble-free.net/centos/5.5/os/i386/repodata/repomd.xml: [Errno 14 ] HTTP Error 404: Not Found
Trying other mirror.
base                                                     | 2.1 kB     00:00
ftp://ftp.ussg.iu.edu/linux/centos/5.5/updates/i386/repodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.
Trying other mirror.
http://centos.cs.wisc.edu/pub/mirrors/linux/centos/5.5/updates/i386/repodata/rep
omd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
http://ftp.linux.ncsu.edu/pub/CentOS/5.5/updates/i386/repodata/repomd.xml: [Errn o 14] HTTP Error 404: Not Found
Trying other mirror.
http://mirror.5ninesolutions.com/centos/5.5/updates/i386/repodata/repomd.xml: [E rrno 14] HTTP Error 404: Not Found
Trying other mirror.
http://mirror.cisp.com/CentOS/5.5/updates/i386/repodata/repomd.xml: [Errno 14] H
TTP Error 404: Not Found
Trying other mirror.
http://mirror.denver.openreaction.net/CentOS/5.5/updates/i386/repodata/repomd.xml: [Errno 12] Timeout: <u
rlopen error timed out>
Trying other mirror.
http://mirror.its.uidaho.edu/pub/centos/5.5/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404:
Not Found
Trying other mirror.
http://mirrors.arsc.edu/centos/5.5/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
http://mirrors.easynews.com//linux/centos/5.5/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404
: Not Found
Trying other mirror.
http://mirrors.xmission.com/centos/5.5/updates/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not F
ound
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: updates. Please verify its path a
nd try again