yum 出现的问题请大侠指教

lxj821212

系统：
               Red Hat Enterprise Linux AS release 3 (Taroon)
                        Kernel \r on an \m
内核：
                2.4.21-4.EL


配置文件：[root@linux root]# cat /etc/yum.conf
[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
tolerant=1
exactarch=1

[base]
name=Red Hat Linux $releasever - $basearch - Base
baseurl=http://www.gtlib.gatech.edu/pub/fedora.redhat/linux/extras/3/i386/

[updates]
name=Red Hat Linux $releasever - Updates
baseurl=http://www.gtlib.gatech.edu/pub/fedora.redhat/linux/core/updates/3/i386/

出错情况：
        yum update
Gathering header information file(s) from server(s)
Server: Red Hat Linux 3AS - i386 - Base
retrygrab() failed for:
  http://www.gtlib.gatech.edu/pub/ ... headers/header.info
  Executing failover method
failover: out of servers to try
Error getting file http://www.gtlib.gatech.edu/pub/ ... headers/header.info
[Errno 4] IOError: HTTP Error 404: Not Found



谢谢！！！！！