Why Cant I Connect To Xbox Live?

I was always able to connect with him, play games and chat for about a year. But then one day we were playing fine and in a chat together, and then one of us shut our systems off accidentally, and now we cant chat, or join each others games anymore....

So when I turn on my xbox, i sign into xbox live just fine and can talk to my friends in party chat and stuff. Then when i put in cod Modern Warfare 3, the game begins to play and it immediately says 'disconnected from xbox live'. Then when i try to...

ok so the other day i was disconnected from xbox live while i was playing for no reason. I uplugged my router and turned the xbox off, waited a min pluged both back in and tested xbox live connection. it connects network but fails internet every time...

i have xbox gold i just bought a 3 mjont sub like 4 weeks ago i been able 2 play game snad stuff on line and do other crap now it logs me out when i go to play a game no matter what i do i cant get on live while in a game but i can get on live while...

okay im connected to the router to the xbox ive been running it this way for a year and i moved rooms and it still worked it will connect to the internet and not xbl i dont know why any insight will help - furry and proud :3

it connects to everything else just fine but then it says live connection failed, i went to the xbox website and tried everything but it wont work. the day before i took out the hardrive

i just got an xbox kinect bundle and I love it. I sign in quickly and my internet usually has 2 or 3 bars. i dont understand why i get 0/50 good matches continuously?! my connection is good. i have a new router so that's not the problem! please help...

this is a problem me and a friend have been having lately whenever i try to join his or anything that he starts or whenever he trys to join me it fails it has to be my profile or xbox doing this. idk does anyone have any ideas??