Hi there, I have recently installed anew server having windows 2003 enterprise server sp1 + ISA server 2004 Enterprise, the problem is that when i allow internal network to use this as dns(active directory) server, it always generate an error meesage at client when we try to join it to a domain controller that is, "The DNS Server cannot be contacted." Note: I am trying to make my isa server a dns (domain controller) server, so that clients could be controlled by a single server.i.e. VPN Clients----><----Internet ----><-----ISA Server Computer(Domain Controller)---><---DNS Clients Computer. can any body help me. M. A. Babur Kiani