Hello, We are running ISA Server w/Windows 2000 Server SP3. We have business class RoadRunner (Cable Service) for our Internet Access, and as of yesterday, we just upgraded to 13 IP's versus the single Static that we had. After changing the primary IP of the NIC card to the first number in the new block, the server came up just fine and all was well. Then after feeling confident that the new configuration was working properly, I decided to bind the remaining 12 IP Addresses, so we could start using our new numbers (for Server publishing). After I do that, the Firewall Service no longer wants to start. I keep getting Event log messages of the following: "Microsoft Firewall failed. The failure occurred during Initialization of Network Address Translation (NAT) because the system call InitNAT failed. Use the source location 308.1113.3.0.1200.50 to report the failure. The error code in the Data area of the event properties indicates the cause of the failure. For more information about this event, see ISA Server Help. The error description is: A device attached to the system is not functioning." I checked the Support site at MS, in addition to the help files, and it came up with nothing that was of any help. How could adding more IP's to the External NIC Card cause all these problems? Is it because ISA is confused as to which IP address it's supposed to NOW use (due to multiple IP's being bound to the card), when doing NAT? I thought the first number in the list would be considered the default number. Could someone point me in the right direction as to how to fix this? Thank you all very much in advance for anything you can throw my way. Mike