Hello I use squid 2.5stable9 on fedora core 4. I want use squid with ldap (Windows 2003) authentications. Client doesn't work and access.log file is: 1139839762.746 0 10.239.57.19 TCP_DENIED/407 1784 GET http://www.microsoft.com/isapi/redir.dll? - NONE/- text/html My squid.conf is: ..... auth_param basic program /usr/lib/squid/squid_ldap_auth -R -b "dc=xx,dc=yyy,dc=uuuu,dc=rrrr" -f sAMAccountName=%s -h 10.239.56.2 auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours auth_param basic casesensitive off ..... acl password proxy_auth REQUIRED 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 443 563 407 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl Safe_ports port 407 acl CONNECT method CONNECT http_access allow manager localhost http_access allow password http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all .... cache_peer another-proxy.xxxx.com parent 8080 0 proxy-only default # Which is the problem?