請問dovecot的問題

[Jimmyme]

Linux的版本是RedHat9,
但當用yum安裝dovecot時(yum install dovecot),
出現Cannot find a package matching dovecot
No actions to take的錯誤訊息,
在/etc/yum.conf裡面
[base]
http://mirror.dulug.duke.edu/pub/yum-repository/redhat/$releasever/$baserch/
[updates]
http://mirror.dulug.duke.edu/pub/yum-repository/redhat/update/$releaserver/
我有把它置換成義守大學或是redhat的網址
http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$baserch/
http://ftp.isu.edu.tw/pub/Linux/Fedora/linux/core/$releasever/$baserch/os
但出現
retrygrab() failed for:
    http://download.fedora.redhat.co/pub/fedora/linux/core/9/i386/os/headers/header.info
    Executing failover method
failover: out of servers to try
Error getting file http://download.fedora.redhat.com/pub/fedora/linux/core/9/i386/os/headers/header.info
[Errno 4] IOError: HTTP Error 404: Not Found
和
retrygrab() failed for:
    ftp.isu.edu.tw/pub/Linux/Fedora/linux/core/9/i386/os/headers/header.info
    Executing failover method
failover: out of servers to try
Error getting file ftp.isu.edu.tw/pub/Linux/Fedora/linux/core/core/9/i386/os/headers/header.info
[Errno 4] IOError: HTTP Error 404: Not Found
的錯誤訊息....
請問是因為什麼原因??

[cosa]

通常 yum install套件的問題都是 yum repo url 設定有錯誤。
請把 baseurl 的項目最前面加上註解 (#)，使用預設的mirrorlist參數即可。