Please post your entire squid.conf (minus any > comment lines) Here ya go, thanks very much. Please note I have commented out 2 lines that allow access to the 172.24.200.x subnet and that allow access via the time acl. This was just for testing.
Gareth ---Squid.conf--- dns_nameservers 127.0.0.1 213.232.95.17 213.242.140.42 # http_port 3128 hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? no_cache deny QUERY authenticate_program /usr/lib/squid/ncsa_auth /etc/squidpass authenticate_children 5 authenticate_ttl 1 hour acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl network src 172.24.200.0/24 acl pass proxy_auth REQUIRED acl daytime time 08:00-23:00 acl SSL_ports port 443 563 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports #http_access allow daytime http_access allow pass #http_access allow network http_access allow localhost http_access deny all icp_access allow all proxy_auth_realm Proxy visible_hostname pluto.exodus.netgs.co.uk