Hello isalist, Microsoft ISA Server adds to a firewall but cannot replace it. That is the belief of my boss. I have at my installation a CSM proxy behind a trihomed Checkpoint firewall. For access to the Internet all requests must pass through the Checkpoint firewall first, then to the proxy server and back to Checkpoint firewall before going to the Internet. My default gateway is the internal address of the Checkpoint firewall. Is it possible to integrate ISA server (integrated mode) into my current network setup without changing my default gateway address? If Yes, how do I go about the ISA server network configuration. All Internet requests have to pass through the Checkpoint Firewall first since the log file created at this point is being used for our auditing purpose. Thanks.