Wow! It works! I've focused on the ttl of the helpers, but i've not noticed that there was also a ttl of the external_acl_type! Really thanks for your help!!! -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Basic-LDAP-on-2008-R2-groups-and-refresh-time-tp4666845p4666943.html Sent from the Squid - Users mailing list archive at Nabble.com.