[squid-users] Rules problem

Hi all,
I need to create a rules where some users, logged in with ntlm, must
be restrictet only in few sites.

I tried something as:

acl RESTRICTED_USER proxy_auth "/etc/squid/restricted_user.allow"
acl RESTRICTED_WEB dstdomain "/etc/squid/restricted_web.limited"

http_reply_access allow RESTRICTED_WEB RESTRICTED_USER
http_reply_access deny all RESTRICTED_USER

It work, but other user seems are affected with continuos
authentication request.

Any suggestion?

Thanks

---
Carlo