i have checked everything in this thread . also i have done every tips from http://squidproxy.wordpress.com/2007/06/05/thinsg-to-look-at-if-websites-are-hanging/ http://squidproxy.wordpress.com/2007/06/05/thinsg-to-look-at-if-websites-are-hanging/ but unfortunately some websites does not open through squid. note1: web sites will open if i manually set proxy settings in my browser ( port 3128 ) but when route the traffic to squid ( port 3129 tproxy ) they don't open . note2: squid server can open those websites simply with lynx . note3: i tested with changing mss even below 500 , changing mtu of router interface and squid interface below 1200 , disabling ECN and WSS etc . no success nothing special in log files even with debug level more than 3 . ubuntu 12.04 server LTS 64bit . squid Version 3.1.19 most of websites work fine but few of them have problem -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Unable-to-access-a-website-through-Suse-Squid-tp1019434p4655294.html Sent from the Squid - Users mailing list archive at Nabble.com.