Xbox live Connection failure

DMZ and UPnP don't mix. Undo one or the other; preferably UPnP enabled, DMZ off.

Greetings, LeFou1990. Can you please reply back with your answers to the following questions? This will help provide us with some extra context behind your situation. In addition, if you are currently using a wireless connection can you try going wired and
let us know if the issue persists? Thanks!



What Country/State/Province do you live in?

Modem brand & model number:

Router brand & model number:

If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter?

Things you have tried:

Is UPnP Enabled? Yes/no/Unknown

Do you have a NAT error? If so, what is your NAT?

Any Error Codes you encounter:

Who is your ISP(Internet Service Provider)?

After you run "Test Xbox LIVE connection" press “Y” for "More Info”. In the pop-up that appears, what are the following values, if shown? (If a value below does not appear for you, just leave it blank.)

W:

X:

Y:

Z:

ID:

L:

Q:

T:

D:

S:

C:

Im having the same problem, however I tested wired by hooking it up to other devices, ie. laptop and ps3 just to make sure. What other options do I have to fix this issue? I would like to play tonight in my clan battle.

If it specifically says "this issue is due to an Xbox Live Core Services error", just wait a few hours (2-3) and check it again. This diagnostic screen notifies you that they are aware of the issue and are working to correct it.

I had the same problem.The way I fixed it was,I changed my wpa2 password for my modem.You're probably entering the wrong password.