Millwall had two penalty appeals turned down as they held Huddersfield in the first leg of their League One play-off at the Galpharm Stadium.
The first of those occurred in the opening half when Scott Barron's shot appeared to strike the raised hand of defender Peter Clarke.
Millwall were denied again by referee Darren Deadman when Barron fell under the challenge of Clarke.
The Terriers went close through Jordan Rhodes and Danny Drinkwater.
Striker Rhodes scooped over from six yards from Lee Novak's right-wing cross before Drinkwater, on loan from Manchester United, forced goalkeeper David Forde to push his curling 25-yard free-kick around the post.
Millwall barely ventured into the Huddersfield area and the closest the Lions came in the opening 45 minutes was when referee Deadman dismissed their penalty appeal, much to the annoyance of manager Kenny Jackett.
His side improved after the break and had the ball in the net - but via the hand of striker Neil Harris, who was shown a yellow card for his indiscretion.
Apart from that chance and the penalty appeal, Millwall produced little to get the away support excited in the closing stages, while Lee Clark's Huddersfield failed to trouble Forde.
The return leg is at the New Den on Tuesday.
Millwall boss Kenny Jackett told BBC London 94: "We defended well and we battled well.
"It does bode well that we can put on that kind of performance. Everything goes on to Tuesday and we'll see what we can do now.
"There will be a good crowd and we need a very good performance on Tuesday to bring our crowd into play. I'm pleased with the performance and commitment of the players."
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Huddersfield 0-0 Millwall
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