Contagion isn't your average Zombie Shooter but instead takes a more realistic and different approach to the popular genre with unique characters, environments, weapons, items, and a built in system that makes every round completely unpredictable with resources, objectives, and paths ever changing.
From their Steam Depot
A link to the site describing the files you download.
Contagion uses same ports as most Source Games
| Port | default |
|---|---|
| Game | 27015 |
Note: Any port will most likely do