Test if the autenticator work.. run "/usr/lib/squid/squid_ldap_auth -R -b "dc=xx,dc=yyy,dc=uuuu,dc=rrrr" -f sAMAccountName=%s -h 10.239.56.2" And enter "Username<SPACE>password<ENTER>" IF you get OK the autenticator Works If you always get an ERR you should chech te configuration of the Helper / the Ldap Server And "for testing only" use this Http_access Schema http_access allow password http_access deny all > 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? >