Multiplayer problem - Solved

[Rabbit]

Hi, my friends and I are having problems with joining each others games. We each (three of us) can host online game and host a friend game but we cannot connect to each other, we are getting stuck on connecting to server screen. It doesn't matter who of us is hosting. But when we try host online game, random players can join but nobody of my friends, it also doesn't matter if we try connect through friends tab or steam invite.
Only way to play together is to connect to some random existing online game assuming there is free slots for us and host allows us to stay... Game version is same for all of us 1.3a15
Also when we try enter OnlineMultiplayer code it says invalid beta code and there is no mutiplayer on dropdown menu. Can somebody please help

[NolanSyKinsley]

Make sure all have opted out of betas, verify integrity of your game caches, and try again. Also the steam servers were down for about 5 minutes as of the time you posted this for routine maintenance that happens every tuesday night.

[TheAsher]

Also make sure all three of you have an open NAT type. If it's not open you could try port forwarding the game. Some people have also tried hamachi

[Rabbit]

Thank you guys for quick response and sorry for late reply. So i did verify game integrity and everything turned ok with it but problem remains. As for opting out of betas I assume that is under steam/settings/account and when I set it there steam restarted but I am still unable to activate online multiplayer code. I tried reinstalling game but nothing changed. Next step will be trying hamachi or tunngle, but since free time is a bit of a issue at the moment it could take a day or two :).

[Rabbit]

Solved by port forvarding steam p2p ports
Steamworks P2P Networking and Steam Voice Chat
UDP 3478 (Outbound)
UDP 4379 (Outbound)
UDP 4380 (Outbound)

[Dimokin]

Did you forward them on your router or firewall?

[Rabbit]

On my router