Multiplayer connection fail

[KawaRu]

Hello,

I bought the game of steam and wanted to play with friends. My friends can connect with eachother but I can't connect with anyone.

I have tried several solutions but none of them worked. Can someone please help me with this?

The sollutions I tried so far:
- Opening port UDP 34197. This port is now forwarded.
- Turning off my fire wall
- Turning off my anti-virus
- Turning off the router firewall.
- Via hamachi
- Via direct connect with IP

None of this works And i have no idea what else I can try. I just keep getting the extremly usefull error that I can't connect. Alhtough I can find all the games.