can't enable windows firewall on rras server

Can't enable windows Firewall on a RRAS server - Windows firewall cannot run because another program or service is running that might use the network address translation component (Ipnat.sys)

Situation: one of our clients could not get the windows Firewall to work. Whenever they tried to start the Windows Firewall, they received the following message: "Windows firewall cannot run because another program or service is running that might use the network address translation component (Ipnat.sys).

What they tried:

They event tried to stop the RRAS but got the same result. They finally make it work by disabling the RRAS.

Recommendation: It is not recommended to use Windows Firewall on a RRAS server. If you use the server as a router, you should enable NAT; if you use the server as VPN, you should have another firewall. If, for some reasons, you do want to enable Windows Firewall in the Windows 2003, you may need to disable the RRAS. To do that, right-click on My Computer>Manager>Services and Applications>Services. Disable Routing and Remote Access service.

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