Does this game have any specific ports?

[Renzal]

My friend timed out when we attempted to play together. Are there any ports I might forward?

[ShaggyMoose]

It worked fine for me without any forwarding apart from the Steam defaults.

[Freed]

make sure you have UPNP enabled on your router and it seems to work fine. I didn't have to do any port forwarding to host yesterday.