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Crossover cable has different pinout (er, whatever it is without pins.) If you are connecting a switch to a router, or two PCs directly to oneanother, then you'd use a crossover cable. Otherwise, it won't work.
Urm, please read the rest of the thread and you'll find that newer network devices have autodetect of cable polarity and etc. and adjust accordingly. The feature is called MDI/MDI-X and you'll find it on most modern network cards.
There's obviously a component somewhere in this network which does not support this feature. Unlucky.