Hi everybody, I have a ISA Server (on W2K srv SP3, stand alone server) in DMZ (not as FW, just Web Publishing). I would like that ISA Server be able to authenticate users of my domain, but DC's ( W2K SRV SP3 ) are in the internal network. Is it possible ? If yes, I suppose that I must open some protocols on the Firewall...but, which ones. Some help or idea's for me ? Thank you in advance. Etienne