West Ham's failure to beat Crystal Palace saw them drop to second place in the Championship table following Southampton's win at Watford.
The Eagles dominated the first half against their London rivals and home keeper Rob Green made several fine stops, most notably from Wilfried Zaha.
West Ham improved after the break and substitute Sam Baldock had two late low strikes saved by keeper Julian Speroni.
Did you know?
West Ham had scored in their previous 10 league games before being held by Palace
But Palace, now unbeaten in five games, held on for a deserved draw.
West Ham undoubtedly had the edge after the interval and will feel they created enough opportunities to earn maximum points.
However Palace, who remain 17 points behind their London rivals, could have been three goals ahead by the end of the first period and the out-of-sorts hosts had Green to thank for keeping the scores level.
The England man made two blocked saves from long-range Chris Martin strikes and also a decent sprawling stop from a fierce Mile Jedinak effort.
But Green's best save saw him react brilliantly to tip over Zaha's deflected strike.
Palace played with a freedom and sharpness in the opening 45 minutes but the introduction of striker Carlton Cole lifted the Hammers.
Cole almost curled home the opening goal with a clever, placed finish after a Zaha mistake in midfield and Ricardo Vaz Te took a heavy first touch but failed to get shot away when played in by Cole.
As the home pressure began to mount, James Tomkins headed over and Palace keeper Speroni twice blocked Baldock shots with his feet at the near post.
But the Hammers could not find a way through a resolute Palace, whose best chance of the half saw Jermaine Easter blaze wastefully wide.
West Ham manager Sam Allardyce:
"As a manager you have to take it but one or two of the players in the dressing room were a little disappointed to get booed because we are at the top of the league (until Southampton beat Watford).
"You build up the expectation as we have done recently having done so well, and we didn't deliver today. But the fans have to stay with us and have to be patient, and then we'll all benefit in the end.
"It was not our best day but the last three games, playing with 10 men, caught up with the lads. I might have made a mistake picking the same team, but they had done so well. We livened it up in the second half but didn't hit the heights we know we can.
"We had probably the two best chances with Sam, but we couldn't convert them."
Crystal Palace manager Dougie Freedman:
"I'm pleased we could come to a big club like West Ham and force them to change shape and personnel.
"We had our chances, so did they. West Ham will always cause you problems but we stuck to our game plan and I felt a draw was pretty much a fair result.
"In my opinion West Ham will get promoted this season as champions."
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Live Text Commentary
Full Time The match has reached full-time.90:00 +3:39
Effort on goal by Jack Collison from deep inside the area goes harmlessly over the bar.90:00 +3:06
Glenn Murray concedes a free kick for a foul on Winston Reid. Mark Noble takes the direct free kick.90:00 +1:43
Winston Reid takes a shot. Mile Jedinak gets a block in.90:00 +1:20
Free kick awarded for a foul by Mile Jedinak on Carlton Cole. Direct free kick taken by Mark Noble.88:30
Free kick awarded for an unfair challenge on Glenn Murray by Abdoulaye Faye. Mile Jedinak fires a strike on goal direct from the free kick, Robert Green makes a comfortable save.87:47
The referee blows for offside against George McCartney. Free kick taken by Julian Speroni.86:29
Corner taken by Gary O'Neil from the right by-line, clearance made by Kagisho Dikgacoi.81:47 Substitution
Substitution Owen Garvan comes on in place of Chris Martin.80:45
The official flags Glenn Murray offside. Robert Green takes the free kick.79:47
Outswinging corner taken from the right by-line by Gary O'Neil, clearance made by Patrick McCarthy.79:17
Inswinging corner taken right-footed by Mark Noble, save by Julian Speroni.78:01
Free kick awarded for a foul by Kagisho Dikgacoi on Mark Noble. Robert Green takes the direct free kick.76:02
Inswinging corner taken by Mark Noble from the left by-line.75:50
Sam Baldock takes a shot. Julian Speroni makes a save.74:41
The assistant referee signals for offside against Glenn Murray. Robert Green takes the indirect free kick.73:35 Substitution
Substitution (Crystal Palace) makes a substitution, with Glenn Murray coming on for Jermaine Easter.73:04
Sam Baldock takes a shot. Save by Julian Speroni.71:42
Robert Green takes the free kick.71:42 Substitution
Substitution Nicky Maynard leaves the field to be replaced by Sam Baldock.
Corner taken right-footed by Chris Martin, Foul by Patrick McCarthy on Joey O'Brien, free kick awarded.71:06
Unfair challenge on Paul McShane by Carlton Cole results in a free kick. Patrick McCarthy takes the free kick.70:17 Booking
Booking Gary O'Neil is shown a yellow card.68:44
Free kick awarded for an unfair challenge on Patrick McCarthy by Carlton Cole. Direct free kick taken by Paul McShane.66:44
Mark Noble concedes a free kick for a foul on Wilfried Zaha. Free kick taken by Julian Speroni.66:23
Mark Noble takes a short corner.65:21
Shot from close in by Jermaine Easter misses to the left of the goal.64:13
James Tomkins has a header from deep inside the six-yard box and clears the crossbar.63:23
Unfair challenge on Jack Collison by Patrick McCarthy results in a free kick. Mark Noble crosses the ball from the free kick right-footed from left wing, Jonathan Parr makes a clearance.62:03 Substitution
Substitution Darren Ambrose leaves the field to be replaced by Sean Scannell.60:41
Shot on goal by Nicky Maynard from long range goes harmlessly over the target.57:36
Anthony Gardner restarts play with the free kick.57:36 Substitution
Substitution Gary O'Neil replaces Ricardo Vaz Te.57:36
Ricardo Vaz Te challenges Mile Jedinak unfairly and gives away a free kick.57:13
Jermaine Easter is ruled offside. Robert Green takes the free kick.56:14
Ricardo Vaz Te takes a shot. Save made by Julian Speroni.52:51
The referee blows for offside. Robert Green takes the free kick.50:32
Effort from the edge of the area by Carlton Cole goes wide of the right-hand post.46:23
The referee blows for offside against Jermaine Easter. Free kick taken by Winston Reid.45:01
The referee blows his whistle to start the second half.45:01 Substitution
Substitution Carlton Cole replaces Julien Faubert.45:00 +5:18 Half time
Half Time The ref blows to end the first period.45:00 +4:52
Darren Ambrose takes a outswinging corner from the right by-line to the near post, Ricardo Vaz Te makes a clearance.45:00 +4:05
Mile Jedinak has an effort at goal from outside the box missing to the wide left of the goal.45:00 +1:42
Inswinging corner taken from the left by-line by Mark Noble.44:43
The official flags Jermaine Easter offside. Free kick taken by Robert Green.42:47
Free kick awarded for an unfair challenge on Jermaine Easter by Abdoulaye Faye. Darren Ambrose fires a strike on goal direct from the free kick, blocked by James Tomkins.41:49
Outswinging corner taken right-footed by Mark Noble, James Tomkins concedes a free kick for a foul on Julian Speroni. Julian Speroni restarts play with the free kick.40:09
Outswinging corner taken from the right by-line by Darren Ambrose, clearance made by James Tomkins.39:24
Free kick awarded for a foul by George McCartney on Wilfried Zaha. Wilfried Zaha takes the free kick.38:38
Mile Jedinak takes a shot. Save made by Robert Green.36:01
Outswinging corner taken right-footed by Mark Noble, Winston Reid takes a shot. Save made by Julian Speroni.33:49
Outswinging corner taken right-footed by Darren Ambrose, Mile Jedinak has a header from inside the six-yard box and clears the crossbar.33:36
Wilfried Zaha takes a shot. James Tomkins gets a block in.33:20
Chris Martin takes a shot. Robert Green makes a save.30:27
Joey O'Brien takes a shot from deep inside the box clearing the bar.26:41
Outswinging corner taken right-footed by Jack Collison from the right by-line to the near post, Darren Ambrose makes a clearance.25:04
Corner taken right-footed by Mark Noble from the left by-line, Unfair challenge on Patrick McCarthy by Abdoulaye Faye results in a free kick. Direct free kick taken by Julian Speroni.24:36
Mile Jedinak takes a shot. Save by Robert Green.22:07
Nicky Maynard handles the ball and concedes a free kick. Mile Jedinak restarts play with the free kick.18:58
Free kick awarded for an unfair challenge on Wilfried Zaha by Winston Reid. Darren Ambrose has a direct shot on goal from the free kick.18:01
Outswinging corner taken right-footed by Jack Collison from the right by-line to the near post.17:14
Jermaine Easter is ruled offside. Free kick taken by Abdoulaye Faye.9:17
Kagisho Dikgacoi takes a shot. Save by Robert Green.7:41
Jack Collison concedes a free kick for a foul on Wilfried Zaha. Patrick McCarthy takes the free kick.4:21
Jermaine Easter fouled by George McCartney, the ref awards a free kick. Free kick crossed right-footed by Darren Ambrose.2:44
Jermaine Easter takes a shot. Blocked by Abdoulaye Faye.1:16
George McCartney has an effort at goal from deep inside the area missing to the right of the target.0:32
Effort from the edge of the area by Darren Ambrose goes wide of the right-hand upright.0:00
The match gets underway.
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