Hi Markus, I wrote the native Windows helpers many time ago, but now I don't remember exactly if the NTLM one needs a DC, but it should, because is a full negotiating NTLM helper. It seems to me that only the Basic one can work using local accounts. Again, I'm not sure, and now I don't have the possibility to make a check. Regards Guido Serassio Acme Consulting S.r.l. Microsoft Gold Certified Partner VMware Professional Partner Via Lucia Savarino, 1 10098 - Rivoli (TO) - ITALY Tel. : +39.011.9530135 Fax. : +39.011.9781115 Email: guido.serassio@xxxxxxxxxxxxxxxxx WWW: http://www.acmeconsulting.it -----Messaggio originale----- Da: Markus Moeller [mailto:huaraz@xxxxxxxxxxxxxxxx] Inviato: venerdì 6 agosto 2010 11.34 A: squid-users@xxxxxxxxxxxxxxx Oggetto: squid on Windows Hi Can I run squid on Windows XP or Vista and provide NTLM authentication for the XP/Vista local accounts or do I need a DC ? Thank you Markus