1st, go to networks connection then check your LAN. There, check for the gateway of your internet.
In, general gateway is at 192.168.0.1 by default. But in some pc, the gateway is different, like mine. So in my case, i cannot go to 192.168.0.1 but 192.168.1.1
There, u could setup your router and open the port u want.
Port require for sro to run is 15779. U can change it in media.pk2 i think
P.s: network connections is in Control panel.
Or use Run -> cmd -> ipconfig/all like the guy in that youtube video.