Hello! I already tried 2 weeks to install Squid 2.6.STABLE18 for Windows. So what I want is following: I created a group in the Active Directory with the Name "InternetUsers", Group Scope "Domain local", Group Type "Security". The group scope "Domain local" is mandatory because we have AD-Trusts with other divisions and the users have the need to login into the Internet from this cross-domain over my Squid. An Example: User in this group: mydomain1\testuser mydomain2\testuser mydomain3\testuser Result of my configuration: Only the mydomain1 users can login successfully with the proxy settings. The other one get a "DINIED" from the squid. So please can somebody help me with my specific problem?? Here are my settings and configurations: My System: Windows Server 2003 Standard Edition SP2 2.3 GHZ 512 MB-RAM 8 GByte - HDD no other services are running is in domain mydomain1 (Is installed on VMWare ESX-Server) AD-Server: Active Directory 2003 Squid Configuration: Installed the Squid Service with these cmd-instructions: C:\squid\sbin\squid.exe -i -f "C:/squid/etc/squid.conf" -n "Squid1" and C:\squid\sbin\squid.exe -z -f "C:/squid/etc/squid.conf" for creating the cash After then I changed the squid.conf file: auth_param basic program C:/squid/libexec/squid_ldap_auth.exe -R -b "dc=stec-01,dc=s-tec" -D "cn=Administrator,cn=Users,dc=stec-01,dc=s-tec" -w "password" -f sAMAccountName=%s -h 172.27.208.59 -p 3268 auth_param basic children 5 auth_param basic realm Squid Proxy Server auth_param basic credentialsttl 2 hours auth_param basic casesensitive off external_acl_type InetGroup %LOGIN C:/squid/libexec/squid_ldap_group.exe -R -b "dc=mydomain,dc=at" -D "cn=Administrator,cn=Users,dc=mydomain,dc=at" -w password -f "(&(objectclass=person)(sAMAccountName=%v)(memberof=CN=%a,OU=Groups,DC=mydomain,DC=at))" -h 172.27.208.59 -p 3268 acl localMAGNA dstdomain .mydomain1.at .mydomain2.at .mydomain3.at acl localnet proxy_auth REQUIRED acl ProxyUsers external InetGroup InternetUsers http_access allow localMAGNA http access allow ProxyUsers First Time I have tried to make this with LDAP. The same with ntlm. Thank you very much in advance for your help. With kind regards Martin