Just purchased RAX45 six channel. will not connect to Xbox One.

Is the rax 45 replacing the old router? If so then can connect either wireless or wired ( wired is better option ) but if the router is too far or you don't want mess of cables wireless is more than enough. There is lots of option you can use to help if you live in busy household like qos. Dmz can prioritise your xbox and will normally open all ports but this can be a security risk . Port forwarding certain ports are normally used for things like strict nat types or a game causing connection problems due to ports.