Thank you for posting here.
According to your description, I understand that:
You have a concern about the error "Windows firewall cannot run because
another program or service is running that might use the network address
translation component" (Ipnat.sys)" when trying to enable the Windows
Firewall service on the SBS 2003 server.
If I have misunderstood the problem, please don't hesitate to let me know.
Yes, you have 2 NICs scenarios that the NAT is enabled on the SBS 2003
server external NIC in RRAS (or ISA). The NAT driver (Ipnat.sys) provides
the network address translation function. It is used by RRAS and Windows
Firewall (or ICS). However, once you enable the NAT in the RRAS, the
Ipnat.sys will be occupied and Windows Firewall cannot start properly. That
explains the error message " Windows firewall cannot run because another
program or service is running that might use the network address
translation component" (Ipnat.sys)".
Hope this helps. Also, if you have any questions or concerns, please do not
hesitate to let me know.
Microsoft Online Partner Support
Microsoft Global Technical Support Center
Get Secure! - www.microsoft.com/security
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