Originally Posted By: Dignan
It's possible the cable is damaged. I was getting some connectivity earlier, though, and I would have thought it was an all or nothing kind of deal.

Cat 5e has 8 wires in it. 10 and 100mbit speeds only use 4 of those wires, with two dedicated to sending and two to receiving. Gigabit will use all 8, and uses the wires differently. Damage to the cable may impact 10 and 100 speeds differently then gigabit.

What link speed is being negotiated? If it's higher then needed (Gigabit when 100 will do) try forcing it down a notch like Bitt suggested. If the switches don't allow this, try to find a 100mbit only switch for one end.