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How to Change the Port for Alien Swarm

"Alien Swarm" is a freeware game, released on Valve Software's Steam platform as a Source Engine mod. It is a top-down co-op shooter, which can be controlled with mouse and keyboard, or dual analog stick controls. The game play resembles "Robotron" and "Geometry Wars," in which players shoot down waves of enemies with upgradable weapons and abilities. To smoothly play online or host dedicated servers for this game, hosts and clients should forward certain ports.

Instructions

- 1
  Click "Start," then type "firewall.cpl," in the search bar. Click the Windows Firewall icon.
- 2
  Click "Advanced Settings" in the leftmost column, then "Inbound Rules," then "New Rule." Click "Port," then highlight "UDP." Type "27000-27020," then name the rule "Steam Matchmaking UDP."
  
  * TCP 27020 to 27050 inclusive
- 3
  Click "Advanced Settings" in the leftmost column, then "Inbound Rules," then "New Rule." Click "Port," then highlight "TCP." Type "27020-27050," then name the rule "Steam Matchmaking TCP."
- 4
  Start "Alien Swarm," and connect to or start a multiplayer match as normal.

Computer Games