Do you can post your squid.conf ? Sure here it is cleaned up. http_port 8080 http_port 83 icp_port 3130 hierarchy_stoplist cgi-bin ? acl QUERY src 0.0.0.0/0.0.0.0 no_cache deny QUERY cache_dir ufs /var/squid/cache 100 16 256 logformat database "%>a":;"%<A":;"%la":;%ts:;%{%F %H:%M:%S}tl:%tu:;%tr:;"%un":;"%ul":;"%Hs":;"%rm":;"%ru":;"%rv":;%<st:;"% mt":;"%Ss" access_log /usr/local/squid/var/logs/access.log database debug_options ALL,1 auth_param basic program /usr/local/squid/bin/squid_radius_auth -f /usr/local/squid/etc/squid_radius_auth.conf auth_param basic children 5 auth_param basic realm xxxxxxxx Proxy Server auth_param basic credentialsttl 12 hours refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 range_offset_limit 1 KB acl password proxy_auth REQUIRED acl approved_sites url_regex -i "/usr/local/squid/etc/approved-sites.txt" acl restricted_sites url_regex -i "/usr/local/squid/etc/restricted-sites.txt" 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 to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 1081 acl Safe_ports port 80 acl Safe_ports port 21 acl Safe_ports port 443 563 acl Safe_ports port 70 acl Safe_ports port 210 acl Safe_ports port 1025-65535 acl Safe_ports port 280 acl Safe_ports port 488 acl Safe_ports port 591 acl Safe_ports port 777 acl Safe_ports port 83 acl Safe_ports port 1081 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 approved_sites http_access deny restricted_sites http_access allow password http_access deny all http_reply_access allow all icp_access allow all cache_mgr xxx@xxxxxxxxxx cache_effective_user squid visible_hostname xxxx.xxxxx.xxx memory_pools on (Doesn't seem to do anything as whenever Squid starts it staes "Memory Pools Off; Limit 2Mb") memory_pools_limit 50 MB coredump_dir /usr/local/squid/var/logs My development system is not so instable, but practically I don't have any acls defined and very many requests. And how many request do you have ? Is there a simple way to figure out how many requests? I know we currently have around a 1000 users. We have two ACL's in use: 1) a global permitted ACL which lists sites that all people can get to, regardless of authentications. 2) A global Deny ACL restricting sites regardless of authentication. We then use the Raidus server to approve users that are allowed out, and then a Standard Deny All. Another info, what OS ? Fedora Core 1. Regards Guido - ======================================================== Guido Serassio Acme Consulting S.r.l. - Microsoft Certified Partner Via Lucia Savarino, 1 10098 - Rivoli (TO) - ITALY Tel. : +39.011.9530135 Fax. : +39.011.9781115 Email: guido.serassio@xxxxxxxxxxxxxxxxx WWW: http://www.acmeconsulting.it/