So we finally have multiplayer ready for public testing, and we have enabled the multiplayer button in the main menu. We are allowing everyone who wants to try the multiplayer to test it out, and report back any errors in the community forums that you find so we can get them filtered out.
We have a disclaimer in the multiplayer area, so you know what is going on with the testing.
Known Errors:
You might have to open up your ports in order to host, we are working on that so you wont have to.
Port to Open: TCP 27015 (SRCDS Rcon port - For dedicated and listen servers)
Community Bug Forums
How To Open Ports