Dedicated server/create game not working for me

So I tried to setup a dedicated server yesterday and it has been online for like 8 hours.
I don't have the cmd screen of yesterday anymore so I paste 1 of today.

As you can see it stops as soon as 1 player joins, I tried going ingame and joining my own server and if I'm the first 1 to join I can join, but if someone already tried to join than I just get an cannot connect error.

I have the following ports opened on my router:
UDP 1200
UDP 27000 to 27015
TCP 27020 to 27039
UDP/TCP 7777-7778

I have no firewall.

Edit:

Even when I try the create game function the game crashes as soon as the first player joins. This is really annoying, how to fix this.