After having set up and configured ISA server it happens the following problem: The win2000 pro (italian) clients configured to receive the IP address from the DHCP server don't get any address. If the ISA client is disabled everything works properly, that is the client receives the addres, but if the ISA client is anabled it receives the addres 0.0.0.0. Thank you for your help. Mauro (MCP)