Hey LS295.
Sorry to hear about your server connection issue. I think that this is best resolved via connection troubleshooting. Can you please click here to try our connection troubleshooting steps, and let me know if this resolves the issue for you? If not, please can you create a support ticket here and provide an image of your connection setup on the XBox, as well as your router settings, that way, we can investigate this further for you.
If you need any further help with this, don't hesitate to let me know.