hi, I have squid 2.6 on Linux OS. The squid cache is configured in reverse proxy mode, means each domain has a mapping web server for objects retrieval. For example: objects of www1.mycompany.com will be fetched from websever1.mycompany.com, objects of www2.mycompany.com will be fetched from webserver2.mycompany.com ... For domains that are NOT configured in the cache server, the squid cache uses first_up_parent, sometime webserver1.mycompany.com, other time webserver2.mycompany.com. This is NOT what I desire. Can the squid cache be configured to return error page or acl denied page if a request is for a domain that is not configured in the squid cache server? If I use acl to achieve this, would i have to one allowed acl for each configured domain and then deny at the very end? It does not sound very effective since I would have a very long acl list. My cache server would have over 100 domains thus 100+ acl. Is there any better way without modifying the code itself? Any suggestions would be very much appreciated. Khanh