Hello, I'm using NTLM scheme like this: auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 30 startup=5 idle=5 auth_param ntlm keep_alive on And it is working fine except for https pages. Here is my basic squid.conf: acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 acl localhost src 127.0.0.1/32 ::1 acl manager proto cache_object acl SSL_ports port 443 acl SSL_ports port 1863 acl SSL_ports port 563 acl SSL_ports port 465 acl SSL_ports port 995 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 563 # https acl Safe_ports port 465 # https acl Safe_ports port 995 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl CONNECT method CONNECT http_access deny CONNECT !Safe_ports http_access allow manager localhost http_access deny manager http_access deny to_localhost follow_x_forwarded_for allow localhost acl AUTENTICADO proxy_auth REQUIRED http_access allow AUTENTICADO regards, Wladner