> > > > > > Any help is really appreciated!!! > > > > > > Try being case-sensitive in the group names. The ones you > configured Squid with do not match the ones you detailed as > example. Assuming both were correct they may be mis-matched > because 'S' is not 's' etc. It was my mistake in the mail. all are lowercase in group names as well as in squid.conf > > > Try also with this as the first of the auth ACL: > acl AuthorizedUsers proxy_auth REQUIRED > http_access deny !AuthorizedUsers > > it will force a login if none is supplied. I tried this too, but No hope. Once again the following is my environment. Win 2k3 (with ADS) <---> Squid Proxy (squid-3.0.STABLE13-1.el5) on CentOS 5.3 (Samba, Winbind, Kerberos, squid configured) now this are my entries; auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp auth_param ntlm children 5 #auth_param ntlm max_challenge_reuses 0 #auth_param ntlm max_challenge_lifetime 2 minutes auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2..5-basic auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours acl AuthorizedUsers proxy_auth REQUIRED http_access deny !AuthorizedUsers external_acl_type unix_group %LOGIN /usr/lib/squid/squid_unix_group acl senior_acl external unix_group senior acl engineer_acl external unix_group engineer acl restricted_acl external unix_group restricted acl guestgroup_acl external unix_group guestgroup acl parttime_acl external unix_group parttime some restrictions like bad sites, proxy sites, game sites, time based restrictions, etc, here... http_access allow senior_acl http_access allow engineer_acl http_access allow restricted_acl http_access allow guestgroup_acl http_access allow parttime_acl http_access deny all If i put "http_access allow AuthorizedUsers" just below the "http_access deny !AuthorizedUsers", it again start allowing all authenticated users, and restricting others. But the group based is not working for me. > > Amos Kindly advice...