yum更新redhat9 用清华的源提示出错,麻烦帮看一下

pchenhui

这是错误信息:
[root@localhost root]# yum update
Gathering header information file(s) from server(s)
Server: Red Hat Linux 9 - i386 - freshrpms
retrygrab() failed for:
ftp://ftp3.tsinghua.edu.cn/mirror/a...ers/header.info
Executing failover method
failover: out of servers to try
Error getting file ftp://ftp3.tsinghua.edu.cn/mirror/a...ers/header.info
[Errno 4] IOError: [Errno ftp error] 421 Too many connections (2) from this IP
这是yum.conf
# $Id: yum-rh.conf,v 1.2 2003/09/18 16:29:06 dude Exp $

[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
gpgcheck=1
tolerant=1
exactarch=1

[os]
name=Red Hat Linux $releasever - $basearch - os
#baseurl=http://ayo.freshrpms.net/redhat/$releasever/$basearch/os
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/ayo.freshrpms.net/pub/freshrpms/ayo/redhat/9/i386/os
[updates]
name=Red Hat Linux $releasever - $basearch - updates
#baseurl=http://ayo.freshrpms.net/redhat/$releasever/$basearch/updates
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/ayo.freshrpms.net/pub/freshrpms/ayo/redhat/9/i386/updates
[freshrpms]
name=Red Hat Linux $releasever - $basearch - freshrpms
#baseurl=http://ayo.freshrpms.net/redhat/$releasever/$basearch/freshrpms
baseurl=ftp://ftp3.tsinghua.edu.cn/mirror/ayo.freshrpms.net/pub/freshrpms/ayo/redhat/9/i386/freshrpms

请问应该怎样更正错误?!麻烦大家指点!