Portsmouth 0-0 Leeds
Neil Warnock's first game in charge of Leeds ended in frustration as Portsmouth produced a battling display.
Leeds striker Ross McCormack came closest to breaking the deadlock when his shot hit the crossbar and bounced down on to the goal-line.
Robert Snodgrass headed home the rebound, but his follow-up effort was ruled out for offside.
Leeds remain four points adrift of the play-offs while Portsmouth fell behind Coventry to 23rd in the table.
Warnock was dealt an early blow when defender Alex Bruce was forced off injured in the 11th minute and replaced by Leigh Bromby.
Both sides found it difficult to carve out clear-cut chances, with Leeds coming closest to breaking the deadlock just before half-time when Snodgrass's shot from a half-cleared corner was brilliantly saved by Stephen Henderson.
McCormack's thumping drive hit the crossbar and bounced down on the goalline and, although Snodgrass followed up to head home, the Scot was deemed to have been in an offside position by referee Phil Gibbs.
Henderson rescued his side again - saving with his feet to deny Luciano Becchio - before Michael Brown lashed a shot over the bar in the 94th minute.