The requested URL could not be retrieved

Pessoal depois que eu coloquei o proxy transparente no server, agora esta aparecendo essa msg "The requested URL could not be retrieved" nas maquinas qdo vão acessar a internet.

Abaixo o meu squid.conf

Código :

 http_port 3128
 hierarchy_stoplist cgi-bin ?
 acl QUERY urlpath_regex cgi-bin \?
 no_cache deny QUERY
 
 
# Regras de ACl's
 
 
  acl sitesbloqueados url_regex -i "/etc/squid/bloqueados/block.txt"
  acl sitesliberados url_regex -i "/etc/squid/bloqueados/unblock.txt"
  acl rede_interna src 200.200.0.0/16
  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 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
 
# Regras de Acessos
 
  http_access deny !Safe_ports
  http_access deny CONNECT !SSL_ports
  http_access allow rede_interna
  httpd_accel_host virtual
  httpd_accel_port 80
  httpd_accel_with_proxy on
  httpd_accel_uses_host_header on

E esse aqui é minha regra para o proxy transparente:

Código :

iptables -t nat -A PREROUTING -s 200.200.0.0/16 -p tcp --dport 80 -j DNAT --to-destination 200.200.1.2:3128

Se alguem puder me ajudar eu ficaria muito grato.