Ok, after various advice I made some progress with the LDAP integration and faults with the acls, and now on client browsers I get an authentication box that asks for the username and password, which I enter (for the realm). The box then disappears and in the status bar of the browser it says 'loading <page>' but never actually displays it. I feel like I am on the final hurdle of this setup and just need a little more advice or troubleshooting expertise. I have included my squid.conf file again for convenience: ### BEGIN SQUID.CONF hierarchy_stoplist cgi-bin ? hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? no_cache deny QUERY auth_param basic program /usr/lib/squid/squid_ldap_auth -b "dc=rlbuht,dc=lan" -f "uid=%s" 172.20.33.3 auth_param basic children 5 auth_param basic realm Squid web-proxy auth_param basic credentialsttl 2 hours auth_param basic casesensitive off refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 acl CONNECT method CONNECT acl auth_users proxy_auth REQUIRED http_access allow manager localhost http_access deny manager http_access deny CONNECT !SSL_ports http_access allow localhost http_access allow auth_users http_access deny all http_reply_access allow all #http_access deny !Safe_ports #http_access allow all icp_access allow all coredump_dir /var/spool/squid Can anyone identify where my problem could be caused? Thanks Danny