CentOS 4.7 無法安裝GNOME - Linux

大家好,我遇到一個問題，那就是我誤刪了gdm的檔案，

於是我想先卸載GNOME在安裝，但是卸載後卻無法安裝

我先用yum grouplist，有看到available groups裡面有

想安裝的 GNOME Desktop Environment

下了指令是yum groupinstall "GNOME Desktop Environemt"

結果出現類似mirror位置錯誤的訊息

Setting up Group Process
Setting up repositories
Setting up repositories
Reading repository metadata in from local files
Passing package list to Install Process
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for gnome-utils to pack into transaction set.
http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/gnome-utils-2.8.0-7.el4.i386.rpm: [Errno 12] Timeout: <urlopen error timed out>
Trying other mirror.
Error: failure: CentOS/RPMS/gnome-utils-2.8.0-7.el4.i386.rpm from base: [Errno 256] No more mirrors to try.

請問有辦法選擇mirror位置嗎?或者是我有打錯?

備註:

系統(IC EDA workstation)有設定host.deny All:ALL只允許特定使用者ip登入
這有關係嗎?
答：關閉嘗試過，還是無法groupinstall
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