Newport slipped to another home defeat on Saturday going down to two second half goals.
Chances were few and far between for both sides in the first half, those that were about could not result in a shot on target.
Portland finished the stronger and a goal apiece for Lewis Clarke and Ryan McKechnie sealed the points for the Dorset side.
Full Time : Newport 0 Portland United 2
Newport: Streeter, Butt, Newbold, Sainsbury, McDonough, Sampson, Holmes, Radford, Beya, Kelly, Wetherick.