In this article we will be discussing a quick and simple method of securing and setting up your firewall to whitelist and protect your Garry's Mod game server. Please direct yourself to the "Firewall Manager" page inside of your portal account.
For the 27015 UDP (GMod Game Port), it is imperative to establish a firewall rule following the specifications detailed below:
Now we will create the Filters for the VSE and Half Life 2/Source as shown below
