http://wiki.squid-cache.org/Features/Authentication#How_do_I_prevent_Login_Popups.3F I have followed the above instruction but still getting login popups. Basically I'm trying to force "Access Denied" page displayed to unauthenticated users instead of the popup. Any help would be much appreciated. Thanks. squid.conf: ... acl ntlmauth proxy_auth REQUIRED http_access deny ntlmauth all