An own goal by Newport's Lee Minshull handed new Stockport County manager Ian Bogie a home win to mark his first game in charge.
The midfielder directed a reflex header into his own net from Alex Kenyon's cross on the hour mark.
The result is a serious blow for Newport's promotion challenge, with the Exiles facing 10 matches in 26 days.
But it was a perfect start for Bogie, who took over at the Hatters following Darije Kalezic's departure in midweek.
VIEW FROM THE DRESSING ROOM
Newport striker Christian Jolley told BBC Radio Wales: "There were a couple of penalties that I thought were outright penalties that didn't go our way today and that's the difference. They nicked a goal and we were struggling at the end.
"I thought they were definite penalties. It's difficult to swallow, but we've got to try and win the game ourselves and not rely on the referee to possibly do the right job for us.
"I know we're talking about ifs, buts and maybes but they're big decisions and they went against us today."
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Live Text Commentary
Full Time The final whistle is blown by the referee.90:00 +4:25
Lenny Pidgeley restarts play with the free kick.90:00 +4:25 Booking
Booking Booking for Simon Hackney.90:00 +4:15
The offside flag is raised against Simon Hackney.90:00 +2:28
Foul by Lee Minshull on Lee Bullock, free kick awarded. Free kick taken by Sean Newton.90:00 +0:15
Shot from just outside the box by Simon Hackney misses to the left of the target.89:42
Close range effort by Aaron O'Connor misses to the left of the target.88:31 Substitution
Substitution Simon Hackney comes on in place of Mark Cullen.87:22
Jon Nolan takes a short corner, Lee Bullock has an effort at goal from deep inside the area missing to the right of the target.83:15
Andrew Hughes is penalised for handball and concedes a free kick. Sean Newton takes the free kick, Jon Macken takes a shot. Save by Lenny Pidgeley.80:36
Inswinging corner taken left-footed by Jon Nolan. Inswinging corner taken by Sean Newton from the right by-line, Will Evans makes a clearance.79:42
Free kick awarded for a foul by Andy Sandell on Mark Cullen. Direct free kick taken by Andy Halls.76:09
Free kick awarded for an unfair challenge on Jon Nolan by Lenny Pidgeley. Free kick crossed left-footed by Sean Newton.74:31 Substitution
Substitution Danny Schofield replaces Danny Whitehead.72:48
Robbie Willmott takes a shot. Save made by Richard O'Donnell.72:09
Aaron O'Connor takes a shot. Save made by Richard O'Donnell.71:21 Substitution
Substitution Jon Nolan joins the action as a substitute, replacing Sam Sheridan.70:06
Inswinging corner taken from the right by-line by Sean Newton, Kieran Charnock takes a shot. Save by Lenny Pidgeley.67:46
Aaron O'Connor is flagged offside by the assistant referee. Richard O'Donnell restarts play with the free kick.65:24
Clearance made by Sam Sheridan.
Substitution Rhys Griffiths is brought on as a substitute for Michael Boateng.65:24
Corner taken right-footed by Andy Sandell from the right by-line,62:51
Sean Newton concedes a free kick for a foul on Andy Sandell. Lenny Pidgeley restarts play with the free kick.62:16
Jon Macken gives away a free kick for an unfair challenge on Robbie Willmott. Lenny Pidgeley takes the direct free kick.60:31 Substitution
Substitution Robbie Willmott on for Christian Jolley.59:33
Assist by Alex Kenyon.59:33 Goal scored
Goal! - Lee Minshull - Stockport 1 - 0 Newport Headed own goal by Lee Minshull. Stockport County 1-0 Newport County.58:21
Inswinging corner taken from the right by-line by Sean Newton.54:39
Unfair challenge on Andy Sandell by Jon Macken results in a free kick. Free kick taken by Lenny Pidgeley.52:57 Substitution
Substitution Will Evans replaces Ismail Yakubu.48:51
Shot by Christian Jolley from inside the box hits the post.47:16
Inswinging corner taken right-footed by Scott Donnelly, save by Richard O'Donnell.45:01
The second half kicks off.45:00 +2:02 Half time
Half Time The whistle is blown to end the first half.45:00 +0:12
The official flags Jon Macken offside. Lenny Pidgeley takes the direct free kick.41:17
The official flags Christian Jolley offside. Free kick taken by Andy Halls.38:42
Jon Macken takes a shot. Lenny Pidgeley makes a save.37:57
Unfair challenge on Byron Anthony by Jon Macken results in a free kick. Free kick taken by Jake Thomson.36:42
Corner taken left-footed by Kieran Charnock, save by Lenny Pidgeley.35:42
Byron Anthony takes the free kick.35:42 Booking
Booking Alex Kenyon is given a yellow card.35:34
Free kick awarded for a foul by Alex Kenyon on Lee Minshull.34:28
Close range shot by Mark Cullen misses to the left of the target.31:53
Danny Whitehead is caught offside. Free kick taken by Lenny Pidgeley.30:32
Lee Minshull has an effort at goal from outside the box missing to the wide left of the goal.29:00
Mark Cullen takes a shot. Save made by Lenny Pidgeley. Corner taken right-footed by Danny Whitehead.27:59
Unfair challenge on Alex Kenyon by Scott Donnelly results in a free kick. Richard O'Donnell restarts play with the free kick.27:18
Jon Macken has a header from deep inside the six-yard box and clears the crossbar.26:53
Aaron O'Connor takes a shot. Save by Richard O'Donnell.25:54
Sam Sheridan delivers the ball from the free kick right-footed from left channel.25:54 Booking
Booking Jake Thomson is given a yellow card.25:42
Jake Thomson concedes a free kick for a foul on Alex Kenyon.24:31
Free kick awarded for an unfair challenge on Christian Jolley by Alex Kenyon. Shot on goal comes in from Andy Sandell from the free kick, save made by Richard O'Donnell.22:49
Corner taken by Sean Newton, save by Lenny Pidgeley. Effort from deep inside the area by Jon Macken clears the bar.21:50
Jon Macken takes a shot. Andrew Hughes gets a block in.20:53
Jon Macken takes a shot. Save by Lenny Pidgeley.19:44
Aaron O'Connor takes a shot. Save by Richard O'Donnell.17:33
Foul by Andy Halls on Andy Sandell, free kick awarded. Lenny Pidgeley takes the direct free kick.16:18
Christian Jolley is caught offside. Direct free kick taken by Richard O'Donnell.15:38
Scott Donnelly takes a shot. Save by Richard O'Donnell.10:34
Jon Macken takes a shot. Save made by Lenny Pidgeley.9:10
Free kick awarded for an unfair challenge on Alex Kenyon by Lee Minshull. Direct free kick taken by Richard O'Donnell.8:15
Free kick awarded for a foul by Lee Bullock on Lee Minshull. Lenny Pidgeley takes the direct free kick.5:42
Inswinging corner taken left-footed by Sean Newton, Andy Sandell makes a clearance.2:51
Alex Kenyon takes a shot. Byron Anthony gets a block in. Alex Kenyon takes a shot. Save by Lenny Pidgeley.1:54
Foul by Lee Bullock on Andy Sandell, free kick awarded. Lenny Pidgeley restarts play with the free kick.0:51
Foul by Byron Anthony on Jon Macken, free kick awarded. Direct free kick taken by Sam Sheridan.0:31
The assistant referee signals for offside against Christian Jolley. Free kick taken by Richard O'Donnell.0:00
The match gets underway.
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