ip authentication for mission-critical computers that require a strict filter group no matter who logs on to it.
ntlm authentication for everyone not sitting at one of these computers.
When browsing from one of the mission-critical computers and tailing /var/log/squid3/access.log, I notice that NTLM is passed to squid3 even though the computer is placed in a filter group based on it's IP for all http requests. However, when browsing to a URL that uses SSL, NTLM is not passed to squid3. Squid3 then prompts the user for credentials.
Version: 2.10.1.1-1
OS: Ubuntu 10.04 Server x64