http://download.fedoraproject.org/pub/fedora/linux/core/updates/3/i386/repodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 530 Sorry, the maximum number of allowed clients (10) are already connected.
Trying other mirror.
Cannot open/read repomd.xml file for repository: updates-released
failure: repodata/repomd.xml from updates-released: [Errno 256] No more mirrors to try.정

이 증상은 업데이트 하는 경로가 틀려서 생기는 오류였다.

이 오류를 고치려고 하면
vi /etc/yum.repos.d/fedora-updates.repo
로 들어간후에

[updates-released]
name=Fedora Core $releasever - $basearch - Released Updates
#baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/$releasever/$basearch/
mirrorlist=http://fedora.redhat.com/download/mirrors/updates-released-fc$releasever
enabled=1
gpgcheck=1

이렇게 되어있는 설정에서
[updates-released]
name=Fedora Core $releasever - $basearch - Released Updates
여기 수정 #삭제-->baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/
$releasever/$basearch/
#삽입-->#mirrorlist=http://fedora.redhat.com/download/mirrors/
updates-released-fc$releasever
enabled=1
gpgcheck=1

한후
ifdown eth0
ifup eth0

한다.