be sure you have your ports forwarded and all tests pass on the plugin setup page for FSD, you will also need the most current title update downloaded and set as active in FSD, or in the games content folder on your HDD(both options work but only use 1)
Strangely enough I never check FSD anymore because even when it fails it still works. I got this advice from another forum post a while ago. I just ensure upnp is selected in FSD and in your router settings. Although if you really struggling then set DMZ mode for the ip your xbox is on. That allows it to be OUTSIDE the firewall which is not a big problem as it's only an xbox lol. Sent from my GT-I9300 using Tapatalk 2