Disabling Spoof Detection in ISA 2004 Firewalls

Spoof detection in ISA 2004 firewalls is a handy feature that helps protect the firewall from spoof attacks. However, there are some circumstances that generate spurious spoofs , such as when implementing NLB. No problem! Here’s the fix, courtesy of our good friend, Barclay Neira:

284811 HOW TO: Disable the IP Spoofing Detection Feature in Internet Security and Acceleration Server

http://support.microsoft.com/?id=284811

Here is the location you would need to update. All other information is the same:

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/FwEng/Parameters

Thanks Barclay!

81 thoughts on “Disabling Spoof Detection in ISA 2004 Firewalls

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