Squid NTLM authentication strange issue

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http://serverfault.com – What I am trying to do is to implement AD authentification to squid, where authorization is based on group membership. Here is relevant part of my squid configuration: auth_param basic /usr/lib64/squid/squid_ldap_auth -R -b DC=example,DC=com -D CN=binduser,OU=Users,DC=example,DC=com -w password -f sAMAccountName=%s -h auth_param basic realm Squid proxy-caching web server auth_param basic children 5 auth_param basic concurrency 0 auth_param basic credentialsttl 7200 seconds auth_param basic casesensitive off auth_param basic blankpassword off auth_param ntlm progra (HowTos)