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Hello. What processes or "things" (?) can block connection between my PC and xbox 360 ? I have connected my xbox 360 and PC with a ethernet cable, and that connection and all that thing worked for me about 4 months, but one day something happened. Suddenly i have been disconnected from XBOX LIVE and from then i can't do any tests ( XBOX LIVE and Media test). But point is not here. The point is, in those tests i can't complete IP Adress test 
As i said, everything worked fine and i do not changed any settings anywhere. In "more info" it says, "Your gateway did not respond to network request". After that i have tryed to turn off all possible firewalls, to create new network connection( not suceeded) and re-configurate all settings, but still, same thing. And other thing. I go START -> RUN -> and typing "ping -t 192.168.0.166" and all the time it says " destination host unreachable". As you figured out already i think, i have made a Connection sharing to my xbox from PC, and all settings in my xbox are correct. So, what the hell happened ? Does something is blocking that connection ? But everytime when i turn on My xbox, in PC it says " Connected local area connection 100mbps". Everything seems to be OK, but there isn't..
If i'm in wrong section sorry, and Sorry for my bad english .
As i said, everything worked fine and i do not changed any settings anywhere. In "more info" it says, "Your gateway did not respond to network request". After that i have tryed to turn off all possible firewalls, to create new network connection( not suceeded) and re-configurate all settings, but still, same thing. And other thing. I go START -> RUN -> and typing "ping -t 192.168.0.166" and all the time it says " destination host unreachable". As you figured out already i think, i have made a Connection sharing to my xbox from PC, and all settings in my xbox are correct. So, what the hell happened ? Does something is blocking that connection ? But everytime when i turn on My xbox, in PC it says " Connected local area connection 100mbps". Everything seems to be OK, but there isn't..If i'm in wrong section sorry, and Sorry for my bad english .