Hello, I sent this mail last month, but I couldn't see the list, I repeat the problem, thanks a lot. I have problems with the authentication. I've followed the faq's rules: acl prueba proxy_auth REQUIRED acl network src 192.168.0.0/255.255.0.0 acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 http_access allow localhost http_access allow prueba network root user1 http_access deny all 2. External authenticator program. % cd helpers/basic_auth/NCSA % make % make install 3. Password file 4. Configure the external authenticator in squid.conf. For ncsa_auth you need to give the pathname to the executable and the password file as an argument. For example: auth_param basic program /usr/local/squid/libexec/ncsa_auth /usr/local/squid/etc/passwd But I'm not able to start Squid: /var/messages: squid: Bungled squid.conf line 444: acl prueba proxy_auth REQUIRED Thanks for your help.