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[TheMuffinMan]

Cable could be bad

Port on the xbox could be bad

check both those

on the xbox i would plug it into the modem and see if lights pop up on it

for the cable just swap out with another crossover

[mtsaint]

a 100% test for the xbox ethernet port is to hook it direct without the router from the wall jack to the port
i used to have problems with my linksys way back . having to power cycle is tedious. everytime the power went out i had to remap all my ports and reset my router YUK!