Here is a solution when host a dedicated server on one pc and host from another pc and both pcs is behind same router
On your DRIVER PC you set open this ports
port serie 1
start and end port
TCP Ports 34447 TCP Ports 34447
port serie 2
UDP Ports 34297 UDP Ports 34297
port serie 3
UDP Ports 34397 UDP Ports 34397
A TCP pop up also that is listening is TCP 34888 no need open up that port
Now is driver pc set up to drive and host server with
If you have problem time joined out on your own server if you host your server on another pc that is connected to your router
You set SERVER PC ports with open this ports
port serie 1
start and end ports
TCP Ports 34448 TCP Ports 34460
port serie 2
UDP Ports 34298 UDP Ports 34310
port serie 3
UDP Ports 34398 UDP Ports 34410
this settings allow you to host 12 servers with open 8 ports
remember to set ip of DRIVER PC and SERVER PC they have 2 different numbers
for ex 1.2 or .1.3 depending how you have plugged in your pcs in the router
it can be useful to copy the dedicated server exe and use one exe to be blank so it not shown in the lobby list it is the second started dedicaded server that people can join and you
And people that race with rfactor one set in multiplayer.ini from 400 to 999 like this
Concurrent Server Updates="999" // servers in join list, should be less for modem users, more for broadband (game now automatically finds more if (3 * download_kbps) exceeds this number)
that way is no need refresh lobby list so u see your server..
Wanna see all servers and join the servers use mutil or do bookmarks and lay in rfactor they are handy when lobby server is down
it can also be done edit the number of ports you wanna use in the dedicaded server by edit this
in the multiplayer ini list Query Port Start="34297" // range is 1025 - 65535
Port Start="34397" // range is 1025 - 65535
to another range betwen 1025 - 65535 be carful so it not is another program you use that use any off this ports.