Forest have now gone four Essex Senior League games against Stansted without a win after going down 4-2 on Saturday.
Solomon Ofori brought Forest back into the game following Stansted’s opener – given despite an obvious offside.
But Ofori soon had to leave the field injured, and Forest found themselves 3-1 down.
Josa Agua gave Forest hope, but a late penalty given against Alan Callaghan – despite the Forest player being fouled – was enough for the home side.