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Forwarding correct ports is an absolutely requirement for hosting a multiplayer game. If you have created a server yet there are no players joining it, chances are your router or firewall is incorrectly configured. In order to host multiplayer games over Steam your network must be configured to allow Steam access to the following ports:
UDP 27015
UDP 27016
UDP 33540
TCP 27015
No
Only player doing the in-game player host has to forward the ports on his computer. But if got a firewall, that got to give the OK too.