I just got the below alert. It says firewall failed, does this mean that I am not getting any firewall service and that I am exposed? Please advise. Thanks. ISA Server name: MAIL Microsoft Firewall failed. The failure occurred during Initialization of reverse Network Address Translation (NAT). because the configuration property of the key SOFTWARE\Microsoft\Fpc\Arrays\{61EFC420-9150-47E4-ADF6-768E993D302C}\Publishing\PNATServerMappings\{5EAA528F-6AAC-4F46-AC06-B150008179D9}\ClientSetsExcluded could not be accessed. Use the source location 2.546.3.0.1200.165 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: The system cannot find the file specified.