Triple check the ordering of the 8-wires at each of the RJ45 connectors -- if any of the colours are out of sequence then it could cause issues like what you have reported here. Ditto if somebody just did straight-through wiring rather than splitting one pair (usually Green) onto pins 3 and 6.

And once again, DX is your Friend: Cable Connectivity Tester (highly recommended!).
Or this one (slightly cheaper): the exact one I have here.


-ml


Edited by mlord (21/08/2011 14:08)