No squid.conf:
# Auth
auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 5
auth_param ntlm max_challenge_reuses 0
auth_param ntlm max_challenge_lifetime 20 minutes
auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
# ACLs
acl ADN dstdomain .hotmail.com .windowsupdate.com .msn.com .microsoft.com .avast.com
acl AuthorizedUsers proxy_auth REQUIRED !ADN
http_access allow ADN
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Permitido
http_access deny to_localhost
http_access deny CONNECT !SSL ADN