Having noticed that squid is now shipping with an mswin_check_ad_group file (I don't recall this in 2.6) I'm working on moving our 2.7 config over to it. In the readme it says: "- Native WIN32 NTLM and Basic Helpers must be used without the -A & -D switches." Our mswin_check_lm_group line used -D as I recall there were lookup problems without it, however I want to check what this line means. What is considered a native WIN32 helper? -A isn't documented as a switch either. Certainly we're a 100% Windows domain. Can anyone clarify this line for me? Thanks, Paul Cocker TNT Post is the trading name for TNT Post UK Ltd (company number: 04417047), TNT Post (Doordrop Media) Ltd (00613278), TNT Post Scotland Ltd (05695897), TNT Post North Ltd (05701709), TNT Post South West Ltd (05983401), TNT Post Midlands Limited (6458167)and TNT Post London Limited (6493826). Emma's Diary and Lifecycle are trading names for Lifecycle Marketing (Mother and Baby) Ltd (02556692). All companies are registered in England and Wales; registered address: 1 Globeside Business Park, Fieldhouse Lane, Marlow, Buckinghamshire, SL7 1HY.