yum在线安装失败？？？？？

用yum在线安装总是失败，网络中yum需要代理已经设置了。配置的源用IE可以登录，就是不知道问题出在哪里。下面是出错的提示，和配置信息。是什么地方配置的不对？？？？？？？？？？

1，yum install ***
提示失败：
Loaded plugins: langpacks, presto, refresh-packagekit
Adding en_US to language list
http://mirrors.163.com/fedora/releases/14/Everything/i386/os/repodata/repomd.xml: [Errno 14] HTTP Error 407 : http://mirrors.163.com/fedora/releases/14/Everything/i386/os/repodata/repomd.xml 
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again


2，yum的repo
[fedora]
name=Fedora $releasever - $basearch
failovermethod=priority
#baseurl=http://download.fedoraproject.org/pub/fedora/linux/releases/$releasever/Everything/$basearch/os/
baseurl=http://mirrors.163.com/fedora/releases/$releasever/Everything/$basearch/os/
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch
enabled=1
metadata_expire=7d
#gpgcheck=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

[fedora-debuginfo]
name=Fedora $releasever - $basearch - Debug
failovermethod=priority
#baseurl=http://download.fedoraproject.org/pub/fedora/linux/releases/$releasever/Everything/$basearch/debug/
baseurl=http://mirrors.163.com/fedora/releases/$releasever/Everything/$basearch/debug/
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-debug-$releasever&arch=$basearch
enabled=1
metadata_expire=7d
#gpgcheck=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch

[fedora-source]
name=Fedora $releasever - Source
failovermethod=priority
#baseurl=http://download.fedoraproject.org/pub/fedora/linux/releases/$releasever/Everything/source/SRPMS/
baseurl=http://mirrors.163.com/fedora/releases/$releasever/Everything/source/SRPMS/
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-source-$releasever&arch=$basearch
enabled=1
metadata_expire=7d
#gpgcheck=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-$basearch


3，yum设置代理，/etc/yum.conf：
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=1
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=3
color=never

proxy=http://***.***.***:***/
proxy_username=***
proxy_password=***

是不是下面这样的格式？

proxy=http://mycache.mydomain.com:3128