Port Forwarding?

The client filters out servers that don't match it's version. Most common reason I've found is if I update too wuickly while the process is still lingering in the background after close. In most cases running validate on the server will resolve it.

 

That looks correct to me @KOOL

Just need to have one like that for each port defined in the multiplayer.ini

 

If you are using the dedicated server exe, ensure it has firewall rules set in windows for inbound connections. If you are hosting from in game then the game exe will need inbound rules. You will also need to ensure there are no other services/games running that are using the same ports at the same time. (steam ports are the most likely suspect here)

The lobby listing uses steam infrastructure so all users will ned to have steam running and also be on the same version of the game to see it in the listing. Do you see other servers listed?

You can test your port forwarding is set up correctly by asking a friend to connect directly using the IP and port number. On the server list click the button with the '+' icon at the top right of the list.

In the box that opens they should enter your public facing ipaddress followed by a colon and the query port number from Multiplayer.ini eg 123.456.789.0:34597
If you server is working and accessible they will see it added to the list. If it is not then you should check the port forwarding again.

(The multiplayer.ini is located in My Documents/Automobilista/userdata/<profilename>/multiplayer.ini or may be at <install dir>/userdata/<profilename>/multiplayer.ini if you are running as admin)