OK Guido ! >You need two components for user authentication /authorization: > >- An authentication helper for USER AUTHENTICATION, this could be win32_auth.exe (basic authentication) or win32_ntlm_auth.exe (NTLM >authentication) Why I can't use the squid_ldap_auth.exe for authentification ? I can't use the win32_auth.exe because squid is not on the same server like my AD... Or I don't understand how win32_auth.exe running... ;-) >- An External ACL helper for Windows group based USER AUTHORIZATION, this could be win32_check_group.exe (native Windows groups) I have tested win32_check_group.exe in commande line and it work !! OK ! >What you don't need is the local group support of win32_auth.exe. Have you an example of authentifiaction/authorization with win32_auth.exe or other for a AD and squidNT running on 2 differents servers ? Thanks a lot.... Jérôme