Создал локальное зеркало репозитория на Alt Linux Школьном Сервере 5.0 и опубликовал его как репозиторий для автоматических обновлений. Использовал для этого утилиту alterator-mirror.

На стороне клиента указал путь к  репозиторию.

В итоге обновиться не получается. При наборе в консоли apt-get update выводит:

Ign http://192.168.0.30 i586 release
Ign http://192.168.0.30 noarch release
Err http://192.168.0.30 i586/classic pkglist
  Undetermined Error
Ign http://192.168.0.30 i586/classic release
Err http://192.168.0.30 i586/classic pkglist
  503 Service Unavailable
Ign http://192.168.0.30 i586/classic release
Err http://192.168.0.30 noarch/classic pkglist
  503 Service Unavailable
Ign http://192.168.0.30 noarch/classic release
Err http://192.168.0.30 i586/classic pkglist
  503 Service Unavailable
Ign http://192.168.0.30 i586/classic release
Err http://192.168.0.30 noarch/classic pkglist
  503 Service Unavailable
Ign http://192.168.0.30 noarch/classic release
Err http://192.168.0.30 noarch/classic pkglist
  Undetermined Error
Ign http://192.168.0.30 noarch/classic release
Failed to fetch http://192.168.0.30/mirror/p5/branch/i586/base/... 503 Service Unavailable
Failed to fetch http://192.168.0.30/mirror/p5/branch/noarch/bas... 503 Service Unavailable
Failed to fetch http://192.168.0.30/mirror/p5/branch/i586/base/... 503 Service Unavailable
Failed to fetch http://192.168.0.30/mirror/p5/branch/noarch/bas... 503 Service Unavailable
Failed to fetch http://192.168.0.30/mirror/p5/branch/i586/base/... Undetermined Error
Failed to fetch http://192.168.0.30/mirror/p5/branch/noarch/bas... Undetermined Error
Reading Package Lists... Done
Building Dependency Tree... Done

E: Some index files failed to download, they have been ignored, or old ones used instead.

В чем может быть проблема?

Да. Из браузера через FTP репозиторий на сервере со всеми его папками виден, правда если захожу через HTTP, то сразу на HTTPS перенаправляет. Может в настройках прокси-сервера ошибка?

Настройки прокси squid.conf

acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
acl localnet src 10.0.0.0/8    # RFC1918 possible internal network
acl localnet src 172.16.0.0/12    # RFC1918 possible internal network
acl localnet src 192.168.0.0/16    # RFC1918 possible internal network
#
acl SSL_ports port 8080        # alterator
acl SSL_ports port 443        # https
acl SSL_ports port 563        # snews
acl Rsync_ports port 873
acl Jabber_ports port 5222 5223
acl Safe_ports port 80        # http
acl Safe_ports port 21        # ftp
acl Safe_ports port 443        # https
acl Safe_ports port 70        # gopher
acl Safe_ports port 210        # wais
acl Safe_ports port 1025-65535    # unregistered ports
acl Safe_ports port 280        # http-mgmt
acl Safe_ports port 488        # gss-http
acl Safe_ports port 563        # snews
acl Safe_ports port 591        # filemaker
acl Safe_ports port 777        # multiling http
acl Safe_ports port 631        # cups
acl Safe_ports port 873        # rsync
acl Safe_ports port 901        # SWAT
acl CONNECT method CONNECT

acl block dstdomain "etc/squid/block_dns"
acl bad_sites url_regex -i "etc/squid/block.txt"

http_access allow manager localhost
http_access deny manager
http_access deny block
http_access deny bad_sites


http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports !Jabber_ports !Rsync_ports

http_access allow localnet
http_access allow localhost

http_access deny all

icp_access allow localnet
icp_access deny all

htcp_access allow localnet
htcp_access deny all
http_port 3128
https:// URLs
access_log /var/log/squid/access.log squid

#Suggested default:
refresh_pattern ^ftp:        1440    20%    10080
refresh_pattern ^gopher:    1440    0%    1440
refresh_pattern (cgi-bin|\?)    0    0%    0
refresh_pattern .        0    20%    4320

Сервер пингуется

[teacher@teacher ~]$ ping 192.168.0.30
PING 192.168.0.30 (192.168.0.30) 56(84) bytes of data.
64 bytes from 192.168.0.30: icmp_seq=1 ttl=64 time=0.268 ms
64 bytes from 192.168.0.30: icmp_seq=2 ttl=64 time=0.267 ms
64 bytes from 192.168.0.30: icmp_seq=3 ttl=64 time=0.275 ms
64 bytes from 192.168.0.30: icmp_seq=4 ttl=64 time=0.250 ms
64 bytes from 192.168.0.30: icmp_seq=5 ttl=64 time=0.254 ms