Xbox 360 can't connect to Internet

I can't, it says that it's not connected to the internet. My xbox one is connected to the internet but when I try to play a 360 game on the xbox one it says that it can't connect to the internet.

But, if I can't connect my xbox 360 to the internet, how do I download the app?

Podría ser tu conexión a internet

Hello

And thank you for your suggestion. I don't have access to another home network, but I did try connecting the Xbox 360 via an iPhone personal hotspot.

The Xbox 360 connected successfully and asked if I wanted to download the system update it needed (due to me having rolled back system updates previously).

I selected "No", because the amount of data needing to be downloaded would have caused an expensive phone bill.

I turned off DMZ on the home router.

Via the usual home networking setup, I tried activating the router/modems internal WiFi (we usually use a separate WiFi base station) and connecting the Xbox 360 directly to the router/modem via its WiFi. The Xbox 360 connected successfully to WiFi, but
could not connect to the internet.

It does look as if there's something about our router that is causing the trouble.

I'd appreciate any troubleshooting suggestions.

Hello Gareth,

Thank you for posting here on the Xbox forums. We definitely appreciate you letting us know all of the troubleshooting steps you have tried to resolve this issue. I would like to suggest an easy step to try out first. This step can help us identify whether
the issue is coming from the network, or the console itself.

Can you try your Xbox 360 on a different network? A different home network would be ideal if possible, but a hotspot could work out as well. Id only use a hotspot if a different home network (friend or family's) is not available, since hotspots can still
cause issues on a console.

I would also like to add that UPnP does not combine well with DMZ. You should try one or the other, never both at the same time. Doing so would cause issues connecting to your network for the device set up with DMZ.