Why skype can not connect through squid proxy

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http://serverfault.com – No matter how hard i tried skype still can not connect to its server. Able to access other HTTPS servers like gmail,but skype is not working through proxy. squid proxy server eth0: with internet connection eth1: connected to LAN Squid running on port 3128 able to access HTTP and HTTPS websites but skype can not. specified Host and port in squids connection page,but still skype can not connect to proxy server. It is not even showing any skype activity in accesslog. (HowTos)