I was barely able to play my game yesterday (5 attempts) against CPU. This afternoon, I tried to sign on my Xbox but it was having connection issues, despite my Internet connecting to PC and tablets. I tried to test and Xbox said I possibly have a NAT error, and that it's configured to "Moderate". I have no idea why this problem suddenly occurred. I'm working on finding solution. Any of you familiar with NAT? It says I need to enable UPnP, or open port 3074 if UPnP isn't supported.