This is the solution that worked for me with xbox and a technicolor, for Cabbage error. https://imgur.com/a/JlicE The image comes from settings Game Sharing and Applications on router. in practice, disable the dmz and turn on the cone (just tick the box in the cone column) in all the doors that concern the xbox. PS: If this post was to be resolutely for everyone (For my case it was), [b]Bungie[/b][u] remember me[/u] ;)