Bonjour,
je suis sous CentOS 4.6 derrière un proxy (sans password) et je ne parviens pas à accéder à l'extérieur.
voici mes fichiers de conf :

/etc/profile
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# /etc/profile
 
# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc
 
pathmunge () {
 if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
    if [ "$2" = "after" ] ; then
       PATH=$PATH:$1
    else
       PATH=$1:$PATH
    fi
 fi
}
 
# Path manipulation
if [ `id -u` = 0 ]; then
 pathmunge /sbin
 pathmunge /usr/sbin
 pathmunge /usr/local/sbin
fi
 
pathmunge /usr/X11R6/bin after
 
 
# No core files by default
ulimit -S -c 0 > /dev/null 2>&1
 
USER="`id -un`"
LOGNAME=$USER
MAIL="/var/spool/mail/$USER"
 
HOSTNAME=`/bin/hostname`
HISTSIZE=1000
 
if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ]; then
    INPUTRC=/etc/inputrc
fi
 
export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC
 
for i in /etc/profile.d/*.sh ; do
    if [ -r "$i" ]; then
     . $i
    fi
done
 
export http_proxy=http://194.167.111.7:8080/
 
unset i
unset pathmunge
/etc/yum.conf
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[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
installonlypkgs=kernel kernel-smp kernel-devel kernel-smp-devel kernel-largesmp kernel-largesmp-devel kernel-hugemem kernel-hugemem-devel
distroverpkg=centos-release
tolerant=1
exactarch=1
retries=20
obsoletes=1
gpgcheck=1
plugins=1
 
#proxy
 
proxy = http://194.167.111.7:8080/
 
# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
/etc/wgetrc
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###
### Sample Wget initialization file .wgetrc
###
 
## You can use this file to change the default behaviour of wget or to
## avoid having to type many many command-line options. This file does
## not contain a comprehensive list of commands -- look at the manual
## to find out what you can put into this file.
##
## Wget initialization file can reside in /etc/wgetrc
## (global, for all users) or $HOME/.wgetrc (for a single user).
##
## To use the settings in this file, you will have to uncomment them,
## as well as change them, in most cases, as the values on the
## commented-out lines are the default values (e.g. "off").
 
 
##
## Global settings (useful for setting up in /etc/wgetrc).
## Think well before you change them, since they may reduce wget's
## functionality, and make it behave contrary to the documentation:
##
 
# You can set retrieve quota for beginners by specifying a value
# optionally followed by 'K' (kilobytes) or 'M' (megabytes).  The
# default quota is unlimited.
#quota = inf
 
# You can lower (or raise) the default number of retries when
# downloading a file (default is 20).
#tries = 20
 
# Lowering the maximum depth of the recursive retrieval is handy to
# prevent newbies from going too "deep" when they unwittingly start
# the recursive retrieval.  The default is 5.
#reclevel = 5
 
# By default Wget uses "passive FTP" transfer where the client
# initiates the data connection to the server rather than the other
# way around.  That is required on systems behind NAT where the client
# computer cannot be easily reached from the Internet.  However, some
# firewalls software explicitly supports active FTP and in fact has
# problems supporting passive transfer.  If you are in such
# environment, use "passive_ftp = off" to revert to active FTP.
#passive_ftp = off
 
# The "wait" command below makes Wget wait between every connection.
# If, instead, you want Wget to wait only between retries of failed
# downloads, set waitretry to maximum number of seconds to wait (Wget
# will use "linear backoff", waiting 1 second after the first failure
# on a file, 2 seconds after the second failure, etc. up to this max).
waitretry = 10
 
 
##
## Local settings (for a user to set in his $HOME/.wgetrc).  It is
## *highly* undesirable to put these settings in the global file, since
## they are potentially dangerous to "normal" users.
##
## Even when setting up your own ~/.wgetrc, you should know what you
## are doing before doing so.
##
 
# Set this to on to use timestamping by default:
#timestamping = off
 
# It is a good idea to make Wget send your email address in a `From:'
# header with your request (so that server administrators can contact
# you in case of errors).  Wget does *not* send `From:' by default.
#header = From: Your Name <username@site.domain>
 
# You can set up other headers, like Accept-Language.  Accept-Language
# is *not* sent by default.
#header = Accept-Language: en
 
# You can set the default proxies for Wget to use for http and ftp.
# They will override the value in the environment.
#http_proxy = http://proxy.yoyodyne.com:18023/
#ftp_proxy = http://proxy.yoyodyne.com:18023/
http_proxy = http://194.167.111.7:8080/
 
# If you do not want to use proxy at all, set this to off.
#use_proxy = on
use_proxy = on
 
# You can customize the retrieval outlook.  Valid options are default,
# binary, mega and micro.
#dot_style = default
 
# Setting this to off makes Wget not download /robots.txt.  Be sure to
# know *exactly* what /robots.txt is and how it is used before changing
# the default!
#robots = on
 
# It can be useful to make Wget wait between connections.  Set this to
# the number of seconds you want Wget to wait.
#wait = 0
 
# You can force creating directory structure, even if a single is being
# retrieved, by setting this to on.
#dirstruct = off
 
# You can turn on recursive retrieving by default (don't do this if
# you are not sure you know what it means) by setting this to on.
#recursive = off
 
# To always back up file X as X.orig before converting its links (due
# to -k / --convert-links / convert_links = on having been specified),
# set this variable to on:
#backup_converted = off
 
# To have Wget follow FTP links from HTML files by default, set this
# to on:
#follow_ftp = off
J'obtiens les résultats suivants :
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[root@XXX ~]# yum update
Setting up Update Process
Setting up repositories
http://mirror.centos.org/centos/4/updates/i386/repodata/repomd.xml: [Errno 12] Timeout: <urlopen error timed out>
Trying other mirror.
Cannot open/read repomd.xml file for repository: update
failure: repodata/repomd.xml from update: [Errno 256] No more mirrors to try.
Error: failure: repodata/repomd.xml from update: [Errno 256] No more mirrors to try.
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[root@XXX ~]# wget http://www.centre-linux.org/IMG/arton312.png
--14:47:35--  http://www.centre-linux.org/IMG/arton312.png
           => `arton312.png'
Connecting to 194.167.111.7:8080... failed: Connection timed out.
Retrying.
 
--14:50:45--  http://www.centre-linux.org/IMG/arton312.png
  (try: 2) => `arton312.png'
Connecting to 194.167.111.7:8080...
sans arriver à aller plus loin.

Pouvez vous me dire ce qui ne va pas ?
Merci d'avance