Squid with openLDAP not working

[shalib2]

My settings are ,
Authentication method  :LDAP
LDAP V:3
Authentication server :10.1.1.25
Authentication server port :389
LDAP server user DN : ou=people,dc=lan,dc=com
LDAP base domain : dc=lan,dc=com
LDAP username DN attribute :uid
LDAP search filter :uid=%s

any idea ???

[dannyb78]

for my windows server 2003R2 right setting is

LDAP username DN attribute :cn
LDAP search filter :cn=%s