Thanks for the answer. To enable HTTP/1.1 is in my case the right way is changing the lines below: http_port 127.0.0.1:3128 transparent http11 http_port 8080 http11 cache_peer 127.0.0.1 parent 8081 0 no-query login=*:nopassword http11 including the http11 parameter? Thanks, Stacker From: Henrik Nordström <henrik@xxxxxxxxxxxxxxxxxxx> Date: 2010/7/13 Subject: Re: ntlm locking user accounts in 2003 AD To: Stacker Hush <stackerhush@xxxxxxxxx> Cc: squid-users@xxxxxxxxxxxxxxx mån 2010-07-12 klockan 12:03 -0300 skrev Stacker Hush: > The problem is when some user request webpages i have alot with of 680 EVENT > (logon) in Windows events/security, with seconds of interval This is normal and by design of Microsoft NTLM authentication. Every new TCP connection by the client to the proxy requires an new NTLM logon handshake. The rate of this is reduced a fair bit if you enable HTTP/1.1 support to clients (2.7 required). But be warned that the HTTP/1.1 client support in 2.7 is quite experimental. > and sometimes > the user account are locked. That's not normal. Regards Henrik