Peterborough had the woodwork to thank as they collected a first home league point since October by battling out a 0-0 draw with Doncaster.Doncaster's Harry Forrester came closest to breaking the deadlock when steering a 52nd-minute free-kick against the crossbar with home goalkeeper Ben Alnwick beaten.The two mid-table sides failed to threaten in a lacklustre opening period, but it was a different story during an action-packed second half.Alnwick was at full-stretch to keep out a deflected Enda Stevens drive before the frame of the goal came to his rescue from Forrester's set-piece.Posh also had their moments as they snapped a run of four successive home league defeats to ease the pressure on boss Darren Ferguson.Luke James was denied by an out-stretched leg of Rovers goalkeeper Sam Johnstone, who also got down smartly to turn a low blast from substitute Nathaniel Mendez-Laing around his near post.James also saw an optimistic penalty appeal turned down after falling under Luke McCullough's challenge late on as the hosts finished strongly.