problemas com autenticação Squid

Olá pessoal
estou com o seguinte problema, meu squid esta rodando legal mas não habilita os acesso ao ip que estão no arquivo ip_liberados.txt, eu montei uma acl, mas não esta funcionando, olhem abaixo:

Squid.conf

http_port 3128

visible_hostname localhost

cache_mem 24 MB

cache_dir ufs /var/spool/squid 5120 64 64

dns_nameservers 200.204.0.10 200.204.0.138

acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443 563
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 563 # https, snews
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 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT

http_access allow localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports

##############################################

acl proibido src "/etc/squid/proibidos.txt"
acl ip_proibido src "/etc/squid/ip_proibido.txt"
acl ip_liberado src "/etc/squid/ip_liberado.txt"

http_access allow localhost
http_access deny ip_proibido
http_access deny proibido !ip_liberado

http_reply_access allow all
icp_access allow all

#############################################

httpd_accel_port 80
httpd_accel_host virtual

##############################################

httpd_accel_uses_host_header on

ip_liberados.txt

##############################################
# #
# IP's liberados de acessar Internet #
# #
# Criado por FÃ¡bio Lima 20/06/2005 #
# #
##############################################
############## - ESCRITÃRIO - ################
# #
#MICRO 3 - ()#
100.100.100.3 #
# #
#MICRO 4 - () #
100.100.100.4 #
# #
#MICRO 5 - () #
100.100.100.5 #
# #
#MICRO 6 - () #
100.100.100.6 #
# #
#MICRO 8 - () #
100.100.100.8 #
##############################################
#Obs.: Por motivos de seguranca nÃ£o fora listado o ip do servidor de
#arquivos.