Hi, I have had a look through the threads and see that there are a few threads on this particular issue but dealing with Unix based squid servers and not Windows platforms. I am having a little trouble getting the squid_ldap_group helper working with NTLM_Auth and running on a W2K3 server. With the config below when you try to browse the net the browser just hangs trying to contact the website, no access denied message appears and I am assuming that the browser has not had a response back from squid. I have checked the cache.log file and I see entries in there saying that the request matched a denied acl rule and access is denied. If you are not in the AD group for denying inet access you get the same browser hang. Not sure what to do from here. auth_param ntlm program c:/proxy/libexec/win32_ntlm_auth.exe auth_param ntlm children 40 auth_param ntlm max_challenge_reuses 0 auth_param ntlm max_challenge_lifetime 2 minutes auth_param ntlm use_ntlm_negotiate on auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours auth_param basic casesensitive off external_acl_type ldap_group %LOGIN C:\Proxy\libexec\squid_ldap_group.exe -b OU=xxx,DC=xxx,DC=xxx -f OU=xxx,DC=xxx,DC=xxx -F OU=xxx,DC=xxx,DC=xxx -h LDAP_server_name -p 389 -S acl inet_deny external ldap_group CN=No-Internet-Access,OU=xxx,DC=xxx,DC=xxx http_access deny inet_deny Any help would be greatly appreciated.