If you intuitively try to use the Windows Firewall applet in Control Panel, you will be greeted with the error message: 

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

This is because RRAS replaces the built in Windows Firewall with its own basic firewall. The solution is to find the firewall settings built into RRAS:

1. Open RRAS: "Administrative Tools->Routing and Remote Access"
2. Expand "[your_server_name]->IP Routing->NAT/Basic Firewall"
3. Right click on the connection you want to configure and select "Properties"
4. Use the "Services and Ports" tab to configure the RRAS firewall.

Add to Favourites
Print this Article