Multiplayer-server connection lost

This game works quite well on singleplayer but for me never worked in multiplayer.
When i search servers i only find empty server and in any case i can't enter in any server because every time about 3-5 seconds from the connection i get the message Connection Lost/Connection Expired.
I have fiber and i didn't have any kind of error message in other multiplayer games.
The game has last drivers as the pc.