Crystal Palace were forced to come from a goal behind to earn a point at London Road.
The home side took the lead on 53 minutes when Shaun Batt finished clinically from the edge of the box before Alan Lee cleverly equalised ten minutes later with a back heeled finish from four yards.
Palace though were forced to see out the remaining 15 minutes with ten men when Paddy McCarthy was shown a second yellow card for a foul on Peterborough's Craig Mackail-Smith.
Ahead of the match Neil Warnock decided to return to the same line up that had served him well in the league prior to the Man City game on Thursday, with Danny Butterfield and Alan Lee returning to the starting eleven.
The home side enjoyed some early pressure and used their flanking players to test the Palace defence with a series of difficult crosses, but Julian Speroni and the back four dealt with them appropriately.
On five minutes Palace had their first sniff of a chance when Neil Danns came within inches of finding Alassane N'Diaye with a decent cross, while Darren Ambrose followed that up with a fierce 25 yard free kick that stung the hands of Posh goalkeeper Joe Lewis.
The Eagles midfielder then had Lewis stuck to his mark when he this time curled a free kick just wide from 20 yards.
Despite much of the home side's pressure, it was only Palace that were carving out the better of the opportunities with Lee coming close with a tame header before coming closer on 21 minutes with a turn and shot from inside the box that Lewis confidently watched wide.
Five minutes later Paddy McCarthy went into the book with an unfortunate challenge 20 yards out when his attempted clearance instead floored Posh striker Aaron Mclean, and from the resulting free kick Tom Williams skied a curling effort over the bar.
On the half hour mark N'Diaye escaped his marker with some neat trickery but his cross was blocked and put out of the play. From the resulting corner Danns fired over with a first time volley inside the area.
Peterborough's best chance of the half came seven minutes later when Shaun Batt skipped past Clint Hill before whipping in a good cross that Jose Fonte did well to head behind. From the corner Mackail-Smith turned and shot from 10 yards out that Speroni saved well.
But the home side found the breakthrough on 53 minutes when Batt picked the ball up just inside the Palace half and was allowed the time and space to carry it to the edge of the box and fire past Speroni.
Lee had a decent effort three minutes later with a deft header to Lewis' far post that the Posh keeper saved well, before being called into action again when Danns fired a volley to his right on 57 minutes.
Crucially, parity was restored on 63 minutes when a cross was headed down from McCarthy to Lee, who cleverly improvised to back heel the ball past a helpless Lewis for his 100th league goal.
However, Palace's celebrations were shortlived when their afternoon and their push for a winner received a huge blow on 74 minutes when Paddy McCarthy was shown a second yellow card. The Eagles defender had been walking a tight line all afternoon with a series of clumsy challenges and a tackle on Mackail-Smith proved one too many and out came the red.
Despite being a man down, Palace pushed on and put the home side under siege for the remainder of the game. But Peterborough defended well and kept the Eagles to just one real chance when, on 79 substitute Ryan Smith saw a run and shot trickle narrowly wide.
With five minutes of normal time remaining the Posh should have taken all three points when Charlie Lee thumped an unmarked header over the bar.
Stay with www.cpfc.co.uk for all the post match reaction. Palace Player is now showing video of the post match conference.
Peterborough United :- Lewis, Martin, Williams (Lee, 85) Morgan, Zakuani, Frecklington, McLean, Boyd, Mackail-Smith, Diagouraga (Coutts, 66), Batt (Rowe, 69)
Unused Subs:- , Keates, McKeown, Pearce, Green.
Crystal Palace:- Speroni, Hill, Derry. McCarthy, Fonte, Ambrose (Smith. 69), Danns, Sears (Lawrence, 75), Lee, Butterfield, N'Diaye (Moses, 69)
Unused Subs:- Clyne, Carle, Flahavan. Scannell, ,