Well it took me nearly 2 months to solve my port forwarding problem. After purchasing a new router, establishing a PPPOE from my ISP's router/modem I still could not get ports 2300-2400 to work. The solution was to set up a "dial up broad band connection" within windows 10.
To the point, if I host a multiplayer mission, do I need to email that mission to my client or does it download automatically? I edited a stock mission (platoon Attack 1) for the LEO 2A5 and saved it with a new file name in my scenarios. Do I need to send this to my buddy first, or will download when he joins my session?