Derby and Ipswich failed to boost their lingering Championship play-off hopes as they saw out a goalless draw.
The visitors had the better of the chances, with Frank Fielding denying both Michael Chopra and Lee Martin in the first half.
Fielding was called into action again after half-time, tipping Jay Emmanuel-Thomas's shot onto the post.
Jason Shackell nearly won it late on for the hosts as his header was cleared off the Ipswich goal-line.
Ipswich had been first to come close to breaking the deadlock, Daryl Murphy advancing down the left before cutting back to Chopra, whose shot on the turn was saved acrobatically by Fielding.
Theo Robinson twice threatened a breakthrough for Derby, fluffing a chance on the counter-attack before putting Gareth Roberts's low cross into the side-netting.
Ipswich again went close early in the second-half, as both Grant Leadbitter and Murphy fired over the bar.
Fielding, who had saved Martin's 25-yard-drive in the first half, was again at his best to stop Emmanuel-Thomas's long-range effort.
Ben Davies's corners troubled Ipswich, Robinson going narrowly wide with a superb scissor-kick before Shackell met another cross that Aaron Cresswell did well to clear.