[squid-users] Problems with ACL max_user_ip on squid2.5 stable3

good day. I want to discourage users from sharing
their passwords (or logging in from from more than one
PC) so I use the "max_user_ip -s" ACL; and
in this configuration on squid-2.5-stable3-

acl me src 192.168.0.0/24
http_access deny !me

acl authenticated proxy_auth REQUIRED
http_access deny !authenticated

acl onlyonce max_user_ip 1
http_access deny onlyonce

http_access allow authenticated

# And finally deny all other access to this proxy
http_access deny all


however, this isn't working. same user still
authenticates from more than one machine at same time,
i am using ntlm authentication against a windows 2000
domain controller.

what can be wrong?
thanks, ola

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