Multiplay involves a TCP connection between two machines. If you are using a firewall, it may be necessary to configure this to let the connection through. To do this you will need to know the port number involved. It is the firewall associated with the host sim that will need configuring.
The port numbers are listed here .
Instructions on how to set up a multiplay here .
Last edited by GeoffM on 15/09/2016 at 03:00