Thanks Amos for your attention and excuse me for my imprecision. I'll give you now more infos: >>missing direct information of what the parent proxy IP and port are (though we can assume from the attempts it's 172.20.127.20 port 801) unfortunately I don't know more about it. > Missing information about whether you even restarted squid to make it take effect. yes, of course. >Missing information about what version of squid this relates to (we have somewhere between a few dozen and 100 releases still in active use, across four quite different versions). Squid 2.6.STABLE5 > Missing information about how you identify the problem (what the visible symptoms are). The client's browser returns: ERROR The requested URL could not be retrieved________________________________ While trying to retrieve the URL: http://translate.google.it/? The following error was encountered: Connection to 74.125.43.101 Failed The system returned: (110) Connection timed out The remote host or network may be down. Please try the request again. Your cache administrator is webmaster. _______________________________ Generated Wed, 25 Nov 2009 13:51:52 GMT by squid (squid/2.6.STABLE5) >Missing information about the rest of the config file. It's mostly related in one way or another, and order-specific to varying degrees. What needs to be seen depends on the problem symptoms and may differ from what you think needs changing. here the squid.conf: http_port 3128 transparent cache_peer 172.20.127.20 parent 801 7 proxy-only hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? cache deny QUERY acl apache rep_header Server ^Apache broken_vary_encoding allow apache access_log /var/log/squid/access.log squid hosts_file /etc/hosts refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 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 # https acl SSL_ports port 563 # snews acl SSL_ports port 873 # rsync 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 Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports acl our_networks src 172.20.63.0/24 192.168.2.0/24 http_access allow our_networks http_access allow localhost http_access deny all http_reply_access allow all icp_access allow all cache_effective_group proxy visible_hostname squid httpd_accel_no_pmtu_disc off coredump_dir /var/spool/squid thank you very much bye Paolo