I have just found out that the 360 does not allow ping requests so that would explain this problem, however I still cannot connect media center extender to it.
I cannot get any computer in my house to connect through the router to the xbox, I can however connect a cable directly to computer 2 and my xbox and get extender to authorise but for some reason I cannot see the computer from the xbox when I try and browse.
I have come to the conclusion that its typical ms shit and I cant be arsed worrying about it, im getting my internet connection back at home at the end of the week and aslong as I can connect to live through my router I'll just keep using the good old xbox 1 for my movies
fingers crossed I can get to live now!!!!