Managing the Server Firewall
Applies To: Windows SBS 2008
The Windows SBS 2008 firewall is enabled during installation, and it helps protect the server from intrusions. After the installation finishes, only installed services are allowed through the firewall. The new firewall is set up so that each service or application can communicate through the firewall.
Important
To help secure your network from unwanted intrusions, you should open only ports that are required to allow your network to run smoothly. When you stop using applications and services, you should close the associated ports.