Hi list, i've followed this guide (semi) successfully: http://wiki.squid-cache.org/ConfigExamples/Authenticate/WindowsActiveDirectory All seems to work (dns resolution, ntp, wbinfo), but Internet Explorer on the clients bring an authentication window. But a) it doesn't accept any credentials and b) it don't want this windows at all . Can somebody give me a hint? Proxy: CentOS 6.3 x64 Squid 3.1.10 ADS: Windows Server 2008 R2 Clients: Windows 7 Windows Terminalserver 2003 Thanks for help -- Marcel