Windows Firewall cannot run because another program or service is running that might use the network address translation component (Ipnat.sys).

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Get this message: Windows Firewall cannot run because another program or service is running that might use the network address translation component (Ipnat.sys). After trying to open Windows Firewall from control panel of SBS 2003. No other problems that I am aware of, just concerned that there is no firewall protecting my server. We have not installed an ISA server yet, but if that would fix the problem I could. However, I didn't want to install it if it would only make problems worse. I have run the Internet connection wizard several times to no avail. What is the best course of action at this point?
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Hello,

Here’s a thought,if you have RRAS running on your server check that the NAT/Basic Firewall component is NOT enabled. If this setting is enabled it will prevent Windows Firewall from working. This component of RRAS uses the Ipnat.sys file to function.

Good Luck!

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