Why cant you host a game on MGO

I believe it requires Port Forwarding techniques.

If you have access to your router, all you need to do is forward port 5730 (default) to your PS3, in my case it was 192.168.2.13.

In order to find out your PS3's IP Address, you can go into your PS3 in Settings > Network Settings > Settings and Connection Status List and use the IP Address listed right beside IP Address.

Hope this helps!

-Crocodila Kiss
I found that after doing all the port forwards, dmz, opening NAT and everything else I read on the internet, that all it took was opening my dsl modem by typing it's IP into my browser. I found a setting that defaulted to keep IP private. Changed that to IP public and was able to host. Didn't change anything else on the ps3 or my router. Good Luck.