Tenta desta forma. Organizai alguns parâmetros
Veja se funciona.
http_port 3128
visible_hostname servidor
#
cache_mem 256 MB
cache_dir ufs /var/spool/squid3 100 16 256
coredump_dir /var/spool/squid3
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
#
acl SSL_ports port 443
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 591 # filemaker
acl Safe_ports port 777 # multiling http
acl CONNECT method CONNECT
http_access deny !Safe_ports
#
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
#
acl proibidos url_regex -i "/etc/squid3/proibidos/sites_proibidos"
http_access deny proibidos
#
#
acl redelocal src 10.22.8.0/22
acl redelocal src 10.5.31.0/24
acl redelocal src 10.5.32.0/24
http_access allow redelocal
#
#
http_access allow localhost
http_access allow all