We are using Squid on windpow as a proxy and we are having an issue when users that come from a child domain to our office do not authenticate properly. Example: our domain is na.myworld.com and users from eu.myworld.com come to our office and do not authenticate correctly The log of the connection is below. 1271280071.727 47 172.23.5.54 TCP_DENIED/407 1766 GET http://www.yahoo.com/ - NONE/- text/html 1271280071.774 31 172.23.5.54 TCP_DENIED/407 2082 GET http://www.yahoo.com/ - NONE/- text/html 1271280099.086 27312 172.23.5.54 TCP_DENIED/403 1449 GET http://www.yahoo.com/ eu\vbonafe NONE/- text/html 1271280104.258 47 172.23.5.54 TCP_DENIED/407 1763 GET http://www.yahoo.es/ - NONE/- text/html 1271280104.289 31 172.23.5.54 TCP_DENIED/407 2079 GET http://www.yahoo.es/ - NONE/- text/html 1271280104.524 235 172.23.5.54 TCP_DENIED/403 1447 GET http://www.yahoo.es/ eu\vbonafe NONE/- text/html 1271280110.274 391 172.23.5.54 TCP_MISS/200 5128 GET http://www.google.com/ - DEFAULT_PARENT/proxy2.us.webscanningservice.com text/html 1271280110.524 63 172.23.5.54 TCP_MISS/204 494 GET http://clients1.google.com/generate_204 - DEFAULT_PARENT/proxy2.us.webscanningservice.com text/html 1271280110.649 157 172.23.5.54 TCP_MISS/204 434 GET http://www.google.com/csi? - DIRECT/72.14.204.103 text/html We have the below acl for users in the Ad global group external_acl_type AD_global_group ttl=120 %LOGIN c:/squid/libexec/mswin_check_ad_group.exe -G and another acl below that allows full access thru the squid proxy using an ad group acl InetAllow external AD_global_group CLW.Squid.Full any ideas????