I have Domain Controller running on Windows 2008 R2, then I have PFSense as Firewall and Proxy. All User Access Internet use Proxy, then I want Authentication User Proxy from Domain Controller. Below configuration from PFSense to get Authentication User from Active Directory Windows.
1. Authentication for User
2. Authentication for Group
PS: another video thanks to http://cehturkiye.com/videos/pfsense/squid-ldap-auth-with-ad/