Hi,
I only modified the helper line as follows:
auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
and added the following two statements, the rest of the file is unchanged.
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
acl authenticated proxy_auth REQUIRED
http_access allow authenticated
