Dear I'm trying to make Squid Cache: Version 3.2.0.13-20111127-r11436 on transparent mode But squid refuse to access to some websites for example google.* is ok but microsoft is impossible. How to fix this issue ? On event : Nov 29 22:18:57 squid2 squid[11257]: SECURITY ALERT: By user agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; MS-RTC LM 8; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) Nov 29 22:18:57 squid2 squid[11257]: SECURITY ALERT: on URL: http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome Nov 29 22:18:59 squid2 squid[11257]: SECURITY ALERT: By user agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; InfoPath.2; MS-RTC LM 8; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) Nov 29 22:18:59 squid2 squid[11257]: SECURITY ALERT: on URL: http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome iptables rules: -A PREROUTING -s 192.168.1.223/32 -p tcp -m tcp --dport 80 -j ACCEPT -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 -A POSTROUTING -j MASQUERADE here it is my squid.conf # IS 3.2 YES # IS 3.1 YES acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 memory_pools off quick_abort_min 0 KB quick_abort_max 0 KB log_icp_queries off client_db off buffered_logs on half_closed_clients off #--------- squidGuard #Disabled enable_squidguard= #--------- SQUID PARENTS (feature not enabled) #--------- acls acl blockedsites url_regex "/etc/squid3/squid-block.acl" acl CONNECT method CONNECT acl purge method PURGE acl FTP proto FTP acl office_network src all #--------- MAIN RULES... always_direct allow FTP # --------- SAFE ports acl Safe_ports port 80 #http acl Safe_ports port 22 #ssh acl Safe_ports port 443 563 #https, snews acl Safe_ports port 1863 #msn 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<td valign='middle'> 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 Safe_ports port 20 #ftp-data acl Safe_ports port 21 #ftp# # --------- Use x-forwarded-for for local Dansguardian or load balancers log_uses_indirect_client on follow_x_forwarded_for allow localhost acl SSL_ports port 9000 #Artica acl SSL_ports port 443 #HTTPS acl SSL_ports port 563 #https, snews acl SSL_ports port 6667 #tchat # --------- RULES DEFINITIONS http_access deny to_localhost url_rewrite_access deny localhost url_rewrite_access allow all http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access allow manager localhost http_access allow purge localhost http_access deny purge http_access deny blockedsites http_access allow office_network http_access deny all # --------- ident_lookup_access hierarchy_stoplist cgi-bin ? # --------- General settings visible_hostname proxyweb # --------- time-out dead_peer_timeout 10 seconds dns_timeout 2 minutes connect_timeout 1600 seconds persistent_request_timeout 3 minutes pconn_timeout 1600 seconds maximum_object_size 300 MB minimum_object_size 0 KB maximum_object_size_in_memory 1024 KB #http/https ports http_port 3128 intercept http_port 3129 # --------- SSL Rules # --------- Caches cache_effective_user squid cache_effective_group squid #cache_replacement_policy heap LFUDA cache_mem 8 MB cache_swap_high 90 cache_swap_low 95 # --------- DNS and ip caches ipcache_size 1024 ipcache_low 90 ipcache_high 95 fqdncache_size 1024 # --------- SPECIFIC DNS SERVERS #--------- FTP specific parameters ftp_passive on ftp_sanitycheck off ftp_epsv off ftp_epsv_all off ftp_telnet_protocol off debug_options ALL,1 refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 refresh_pattern -i (/cg-bin/|\?) 0 0% 0 #Logs------------------------------------------------- coredump_dir /var/squid/cache cache_log /var/log/squid/cache.log pid_filename /var/run/squid.pid error_directory /usr/share/squid-langpack/en logformat common MAC:%>eui %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh cache_store_log stdio:/var/log/squid/store.log access_log syslog:authpriv.info common workers 2 cache_dir rock /var/cache/RockStore-0 256 max-size=32768 cache_dir rock /var/cache/RockStore-1 256 max-size=32768 cache_dir ufs /var/cache/squid 2000 16 256 # --------- OTHER CACHES