Get disconnected and cant connect with anybody.

You should check your NAT.  

Go to the My Xbox channel then over to the System icon, then look under Network Settings.  

Run the "xbox live connection test" and pay particular attention to your NAT result.  

You want it to be OPEN, not MODERATE or STRICT.  If it is OPEN, nothing will show up when you run the test, if it is not OPEN it will show that it is moderate or strict.

If it is not OPEN, then you need to adjust settings on your router to get it open.  

Try to enable UPnp (Universal Plug and Play) on your router, as a first step.

You can also learn more here

support.microsoft.com/.../979000

and here

www.unofficialguidetolive.co.uk

and here

support.xbox.com/.../kb.aspx

and even more here

www.xbox.com/.../NATs-and-xbox-live

If you need Xbox live certified firmware for your router, you can check here

www.unofficialguidetolive.co.uk/.../livecertifiedfirmware.htm

In my first comment i wrote that my nat type is open, even if it was strict, i wouldnt get disconnected all the time. But thanks anyway.

Did you try the other steps listed above?

Hi

Can you answer these questions:-

What Country/State/Province do you live in?

Modem brand & model number:

Router brand & model number:

Network Connection Type: Wireless/Wired

If Wireless, what type of encryption are you using?

Things you have tried:

Is UPnP Enabled? Yes/no/Unknown

Is NAT Type Open?

Any Error Codes you encounter:

What type of internet do you have? Cable/DSL/T1/3G?

Who is your ISP(Internet Service Provider)?

When you run "Test Xbox LIVE connection" what is the exact message shown on screen?

Norway.

No modem, router : jaht js-2005ep.

Wired.

UPnP is enabled, nat type is open.

Provider : NextGenTel.

When i run Text XBox live connection, it doesn't show any message at all, it just finishes.

But i am living in a house with another family, they are living in the second floor, and we are sharing same internet, but they may have a modem/router, but i dont which one they have, you think it may have something to do with them ?

Hi

The js-2005ep is just an Ethernet switch not an actual router, so it must be linked up to their modem/router. You say your NAT is Open when you run the Xbox live test, but what about in matchmaking in COD? It shows your NAT status there also, what does that show up as?

Can you also go here:-

http://www.pingtest.net

and here:-

http://www.speedtest.net

And run the tests, when the test are completed you will get the option to copy a forum link of the results, please do that and post back your result link.

• If you leave the Xbox on marketplace does it also disconnect after 5mins? 
• Is it always exactly 5mins?
• Does it do it in all games or just call of duty?