I
think that the minimum cable length for ethernet cable is 18 inches, but it should work anyways. I agree with Blu, you most likely have a hosed wall jack or one of those 800 little pieces of cable isn't all there. Your maximum distance is well within spec (100m).
I have a 2-piece tester from Paladin Tools at work which works great
http://www.cdw.com/shop/products/default.asp?EDC=213663 but it's a little expensive if you're just going to use it a couple of times. A former co-worker of mine has this one
http://www.cdw.com/shop/products/default.asp?EDC=240795 which is cheaper and works well.
[Edited by topane on 01-31-2001 at 01:21 PM]