Actually I have squidnt 2.6 on windows 2003 and all works correctly using "mswin_check_lm_group.exe". Ntlmv2 is also configured on mine domain controller and clients use wonderful wpad I'd like to test the same "topology" using a linux machine and reading squid doc I have understood that this is possible using a version of Samba > 3.02 (that support ntlmv2) and "ntlm_auth" This sounds good and support ntlmv2 BUT require the join to the domain Now I have 3 questions: 1)Ldap auth I have some devices like "fortigate800", "hp printers" etc...that support ldap authentication and obviously this devices are not joined to the domain but they simply query mine domain controller; example: user insert his username/password in hp printers and they are able to print. Because I would like configure squid in the same way I searched on google that produced this interesting link (http://papercut.biz/products/ng/manual/apdx-proxy-squid.html) that explain "Squid authentication with LDAP / Active Directory" Thus if I have correctly understood this is my case but because most of docs I founded were related to samba I have some doubt about it.... Does it work correctly? What are cons? Is it what I need or are there better solutions? My configuration should be like this: Internet explorer (ntlm)---->squid----(ldap query with rules)---->Active Directory Dc but no ad join 2) Firefox and ntlm support Does Firefox support ntlmv2 both in windows and linux? 3) Firefox and wpad I saw that firefox doesn't support wpad (that is wonderful in my opinion); how is possibile? Why firefox developers doesn't add wpad support both on windows and linux? Thanks Marco Italy