squid não bloqueia sites

opa pesoal não sei porque o meu squid não ta bloqueando os meu sites
#Recommended minimum configuration:
acl all src 0.0.0.0/0.0.0.0
acl blockedsites url_regex -i "/etc/squid/bloqueados/block.txt"
acl unblockedsites url_regex -i "/etc/squid/bloqueados/unblock.txt"
acl rede_interna src 192.168.0.0/24
acl download url_regex -i .exe .zip .mp3 .bat .pif .scr .com .vbs .ppt
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

# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager
# Deny requests to unknown ports
http_access deny !Safe_ports
# Deny CONNECT to other than SSL ports
http_access deny CONNECT !SSL_ports

# And finally deny all other access to this proxy
http_access allow all rede_interna
http_access allow unblockedsites
http_access deny blockedsites
http_access deny download
http_access allow localhost
http_access deny all

no arquivo block.txt eu coloquei para bloquear o site do terra e eu coloquei la dentro
http://www.terra.com.br mas não esta travando o que pode estar errado
obrigado