yum cannot find a mirror

[quincy360@gmail.com]

I have FC 5 on my toshiba laptop and need to upgrade the kernel in order to download the driver for my wireless card:

I got this msg when I initially try to execute yum:

[root@localhost ]# yum upgrade kernel
Loading "installonlyn" plugin
Setting up Upgrade Process
Setting up repositories
core
Cannot find a valid baseurl for repo: core
Error : Cannot find a valid baseurl for repo: core

I resolve this problem by going to the repos directory and uncommenting the lines baseurl....in the fedora repo files.

now when I execute yum I get this error:
loading "installonlyn" plugin
setting up repositories
core
http://download.fedora.redhat.com/pu...ata/repomd.xml:
[Errono 4] IOError: <urlopen error (-2, 'Name or service not known')> Trying other mirror.
Cannot open/read repomd.xml file for repository: core
failure: repodata/repomd.xml from core: [Errono 256] No more mirrors to try.
Error: failure: repodata/repomd.xml from core: [Errono 256] No more
mirrors to try.


Does anyone has a solution for this kind of problem?
I will appreciate whatever help I can get.

[devils casper]

post the contents of fedora-core.repo file.






Casper

[quincy360@gmail.com]

This is the contents of fedora-core.repo:

[core]
name=Fedora Core $releaserver - $basearch
baseurl=http://fedora.redhat.com/pub/fedora/linux/core/$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 - $basearch -Debug
baseurl=http://fedora.redhat.com/pub/fedora/linux/core/$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 $releasever - Source
baseurl=http://fedora.redhat.com/pub/fedora/linux/core/$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


This the contents of yum.conf
[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
plugings=1
metadata_expire=1800

# PUT YOUR REPOS HERE OR IN separate files named filed.repo
#in /etc/yum.repos.d

[devils casper]

is your internet connection working fine? repo file is correct.
execute this

yum -y clean all

Casper

[quincy360@gmail.com]

I have internet connection and I've already tried yum clean all and yum clean packages cmd and got the same error

[quincy360@gmail.com]

my internet connection is only working when I physically connect my laptop to the router. It doesnot detect my wireless card.