Can't find the server (Farming Simulator 15)

Faced such a problem ...
The game was bought i.e. licensed.
I create a server with a password. A friend comes in and cannot find my server. Tried changing the filter doesn't help.
I wanted to try to find (Join) Through Steam ... There it turns out he created a current ... and bought the game with a key and Steam asks for 200r on the account which he does not have so he can add to friends ...
There is also an assumption that the router does not allow to create , but in fact it is also created in their server ...
My hardware is powerful (GTA 5 flies at maximum speed, it's just too lazy to describe all the hardware ...) Regarding the Internet 70 megs / sec dynamic IP
PS, thanks in advance for the sensible answers.