Hi Amos, Thank you for the response, actually i'am working with IPV4 on my network architecture. All the client are connected to a DC Windows 2012 server that manage DNS,DHCP and AD. The proxy server is not under the domain controller and have a static Ip adress. Any way I will try to run MTU Path and i will give you feed-back. Other way would you advise me to installa nother version of Squid proxy? Regards, Khalil -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/squid3-block-all-443-ports-request-tp4664735p4664867.html Sent from the Squid - Users mailing list archive at Nabble.com.