Hi, I'm trying to setup a Squid server (Centos 5.5, Squid 2.6-STABLE21, x64) to help my users to connect to Windows Live (as well as to provide navigation). They _must_ use Windows Messenger (4.x, 5.x - the ones shipped by default with Windows XP). The Windows Messenger app login successfully (if you enter a wrong username/passw combination it refuses to connect) but cannot complete the sign in process, displaying (almost indefinitely "Singing in..."). Looking in access.log, I only see: 1288735315.171 6858 172.22.8.202 TCP_MISS/200 8272 CONNECT login.live.com:443 - DIRECT/65.54.186.17 - And then (many times, actually!): 1288735321.511 2048 172.22.8.202 TCP_MISS/200 1539 POST http://64.4.44.76/gateway/gateway.dll? - DIRECT/64.4.44.76 application/x-msn-messenger I tried using Windows Live Messenger (2009) and it worked perfectly. I even tried using an ISA Server 2006 with Windows Messenger (5.x) and it worked as well. I don't have yet any special/tricky ACL, only "http_access allow all" to avoid confusions. Does anybody has a similar setup (squid + windows messenger) ? Any help is appreciated.