I have to set up a proxy for my work's network. No computer except the proxy has a direct internet connection. The proxy will NOT be transparent so it authenticates with Active Directory and allows or denies pages.

The squid proxy is up, and working accordingly, denying and allowing what's needed to who's needed. BUT! Thunderbird and Outlook didn't work, so in less than 10 minutes I was forced to fall back.

I read googling a lot, and searching a bit here about socks, which seems to be what I need but also that squid is already a socks proxy.

Web pages were the concern, it's not needed that other stuff is authenticated, it might as well be transparent for Outlook, Thunderbird and other programs *for example, it's not needed to block a Warcraft III game, though, allowing it explicitly is not the point either* but as of now, none can connect *haven't actually tried Warcraft though, but stuff like Adobe's updater didn't work either and I recall someone mentioned Windows Live messenger didn't either*

The Squid Proxy is a CentOS.

is there any additional information that I need to include?