Ip adress everytime i sign into xbox live it says that i cant and then when i test connection it fails on my ip address

First i want to know how is your xbox 360 connected to the internet? For example ( Modem Connection?, Router Connection?, Or Wireless Connection?

Here are some steps that you need to try:

1. Turn off your cosole wait for 20 seconds and then turn it back on, then test your xbox live connection

2. Go to your network settings

3. Select restore to factory defaults and test your xbox live connection

if u dont hav e a router that is ur problem. to get ur xbox 360 to connect to vista media center you cannot connect an ethernet cord directly to ur 360, u must have ur computer hooked to a router with one ethernet cord and a whole different ethernet cord connecting to the same router the computers hooked up to. after you do that go to ur vista media center, turn active sharing on, make sure your router is connected to the internet. then go to ur xbox 360 and follow the on screen instruction from the the connect to media center screen.
if your wanting to connect to xbox live and stuff like that, and u enter ur ip address and security information and it tells u that the ip adress u entered is already in use by another device, and that ur xbox 360 needs to be assigned one, do this: simply go to were u put in ur ip address and set it to get the address automaticly (or in other words choose automatic). then go to test connection (ur router should automaticly assign ur xbox 360 an ip address) and ur router should connect to the internet. if it connects to the internet but not xbox live then u have not yet sign up for an xbox live account.

by the way when u make an xbox live account please send me a friend request. my xboxc live account name is: ghdude22

glad i could help!!! :3

You don't set the IP address (You can but that's a whole nother story, IP address' have to be unique to the device), you need to let your router assign one automatically. Two devices on the same network can't have the same IP address or it will fail to function completely.

mtu is not working cant hook up xbox live

I think you need to ring your internet provider and they will enable xbox live from their side. Its fairly simple and they will know what your talking about.

You need to go to xbox.com and sign up for xbox live before you can sign in.

find the IP adress on ur router if its wirless

Connect it to your router with an ethernet cable.
Make sure the router is setup correctly to your modem, if you can connect all your devices by ethernet cable to the internet then it's set.
If you are using a wireless connection and if it asks for the WEP or WPA key, make sure that you are entering the correct encryption key. You may want to call your router manufacturer to know the correct key for the wireless connection. FYI, it will say that the wireless network is connected but it will still fail the IP Address.

If you have a wired connection and the IP Address or DNS failed, I suggest you to call your Internet Service Provider to check for the Internet connection and obtain these (static IP address, subnet mask, default gateway, primary DNS server and secondary DNS server). If your Internet is okay, enter the IP settings manually on the console (System > Network Settings > Edit Settings > IP settings).

That should work.

reserve the ip address for the xbox in the router
and do port forwarding and open the xbox ports for the reserved ip

For some reason everyone has the same problem buy the Xbox 360 wireless kit and should work but for now you might as well just wait untill get its fixed