е пойму в чем грабли (

http://mirror.khlug.org/centos/4.7/updates/i386/RPMS/vnc-ser...: [Errno 9] Requested Range Not Satisfiable
Trying other mirror.
http://ftp.daum.net/centos/4.7/updates/i386/RPMS/vnc-server-...: [Errno 9] Requested Range Not Satisfiable
Trying other mirror.

wget http://mirror.khlug.org/centos/4.7/updates/i386/RPMS/vnc-ser...
--08:50:05--  http://mirror.khlug.org/centos/4.7/updates/i386/RPMS/vnc-ser...
           => `vnc-server-4.0-12.el4.1.i386.rpm'

Устанавливается соединение с 192.168.1.1:8080... соединение установлено.
Запрос Proxy послан, ожидается ответ... 200 OK
Длина: 1.189.926 (1.1M) [application/x-rpm]

100%[=========================================================>] 1.189.926      2.28M/s

08:50:06 (2.27 MB/s) - `vnc-server-4.0-12.el4.1.i386.rpm' сохранён [1189926/1189926]

даже links нормально ходит по ссылкам и качает
# yum clean all
Cleaning up Everything
0 headers removed
0 packages removed
12 metadata files removed
0 cache files removed
4 cache files removed
# yum update
Setting up Update Process
Setting up repositories
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
addons                    100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 113 kB    00:00
update    : ################################################## 377/377
primary.xml.gz            100% |=========================| 608 kB    00:00
base      : ################################################## 1591/1591
primary.xml.gz            100% |=========================|  190 B    00:00
primary.xml.gz            100% |=========================|  37 kB    00:00
extras    : ################################################## 164/164
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for vnc-server to pack into transaction set.
http://centos.candishosting.com.cn/4.7/updates/i386/RPMS/vnc...: [Errno 9] Requested Range Not Satisfiable
Trying other mirror.
http://centos.siirappi.com/centos/4.7/updates/i386/RPMS/vnc-...: [Errno 9] Requested Range Not Satisfiable
Trying other mirror.

дальше убираю из переменных окружения прокси и делаю через
# cat /etc/yum.conf
[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
installonlypkgs=kernel kernel-smp kernel-devel kernel-smp-devel kernel-largesmp kernel-largesmp-devel kernel-hugemem kernel-hugemem-devel
distroverpkg=centos-release
tolerant=1
exactarch=1
retries=20
obsoletes=1
gpgcheck=1
use_proxy=on
plugins=1

proxy=http://192.168.1.1:8080/
proxy=ftp://192.168.1.1:8080/

Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 192.168.2.2:32839          isa.четатам.ru:webcache      ESTABLISHED 15078/python

# yum update
Setting up Update Process
Setting up repositories
висит 3 минуты (

Exiting on user cancel
[root@oracle-test ~]# env | grep proxy
[root@oracle-test ~]#

т.е сейчас в окружении прокси неуказано . только в yum.conf