Hello all, I am Samba to authenticate users in Windows 2000 AD to a Squid proxy server. I have Red Hat 9, Samba 3.04, and Squid 2.5 Stable3. I have followed the FAQs and docs as closely as possible, and everything went pretty much without a problem. The only hangup I am having is trying to restrict access to the proxy to members of a single AD group. In my squid.conf I have, auth_param ntlm program /usr/bin/ntlm_auth \ --helper-protocol=squid-2.5-ntlmssp that works fine. In the Samba docs they indicate you can do this, auth_param ntlm program /usr/bin/ntlm_auth \ --helper-protocol=squid-2.5-ntlmssp \ --require-membership-of='DOMAIN/Group' When I try that though, I get these errors in cache.log utils/ntlm_auth.c:get_require_membership_sid(237) Winbindd lookupname failed to resolve 'DOMAIN/Group' into a SID! If I do wbinfo -n Group, I get a sid and wbinfo -s "sid" gives me the group. I have gone through mailing list and seen some people that indicate you can use an external helper like wbinfo_group.pl, but I just wondered if second squid.conf setting I got from the Samba docs is known to work, or if there is something else I need to look at?