Ephron Mason-Clark struck twice to hand Darren Ferguson a winning start to his fourth spell as Peterborough manager with a 2-0 victory at Port Vale.
Port Vale scored three late goals to claim a 3-1 comeback victory over Forest Green that leaves Rovers at the foot of the League One table.
Paul Digby’s late own goal proved decisive as Port Vale won 1-0 at Cambridge.
Derby suffered a shock 2-1 home defeat to Port Vale in a controversial match at Pride Park.
Ellis Harrison scored a stoppage-time winner as Port Vale ended their three-match winless run in Sky Bet League One with a 2-1 victory over Shrewsbury.