Network Connections

[benmonty]

What are the network connections Rimworld makes when it is starting?  I am running the game on a Mac through Steam with mods installed.  I don't have multiplayer installed.

When I start the game I see a lot of UDP connections to various IPs with ports in the range 27015-27060 (not sure if that's all of them).  What is the purpose of these connections?  Will the game run correctly if I block them?  If these connections are required, can someone confirm the protocol and port ranges necessary for the game to run correctly?

Thanks!