Two second half goals consigned the Blades to a disappointing 3-1 defeat at Thorpe Arch on Monday afternoon.
After a quiet first half hour Terry Kennedy headed the Blades in front from a Jordan Chapell corner, only for the home side to equaliser before the break with a speculative long range effort.
In the second half the hosts scored twice in the space of ten minutes, the second coming from the penalty spot to put the game beyond United, who then missed a late spot kick of their own.
United arguably had the better of the game in the opening exchanges and duly got their reward when KENNEDY rose highest to head home Chapell's pinpoint centre in the 34th minute.
The advantage was erased six minutes later when the Blades failed to pressurise the ball and DAWSON lashed home past Dewbury from in excess of 30 yards to send the teams in all square at the break.
After the hour HABIBOU put the hosts in front from the penalty spot after the referee spotted an infringement in the Blades box.
Within ten minutes Leeds were 3-1 up when WALTERS out jumped Jordan Hodder to head home a deep cross.
With less than five minutes remaining, the Blades had the chance to set up a grandstand finish after Hill, on his return to action, was upended in the penalty area following a surge forward.
Ironside stepped up but spurred the chance from twelve yards to cap a frustrating afternoon for Chris Morgan's youngsters.
Speaking afterwards Morgan said the United's overall performance and application wasn't good enough:
"I am bitterly disappointed with the result and performance, especially having gone in front in the first half.
"We probably shaded the first period, but having taking the lead we sat back and conceded a goal that should have been avoided.
"After the interval we didn't really get into the game, we didn't play with enough effort or desire and that is particularly annoying after we had got a foot hold in the game.
"The two positives were the performances of Matt Hill and Jordan Chapell, who both got some much needed game time under their belts."
Blades: Dewbury, Westlake, McFadzean, Harriott (Smith 76), Kennedy, Hill, Chapell (Hodder 76), Whitehouse, Ironside, De Girolamo (Pemberton 81), Tonne.