Yan Klukowski's last-minute penalty earned Forest Green a deserved point against Cambridge.
The visitors took the lead when debutant Tom Elliott headed home Josh Coulson's pin-point cross.
But they could not hold on, and Klukowski slotted home from the spot after Kevin Roberts bundled over James Norwood in the box.
Rovers almost snatched all three points, but Coulson was able to clear Ben Wright's dangerous free-kick.
VIEWS FROM THE DRESSING ROOM
Forest Green Rovers manager Dave Hockaday told BBC Radio Gloucestershire:
"The way the game went we have to be grateful that we've taken a point but I want this to be a fortress, so that's two points dropped for us.
"It's a great team performance, we just kept on going. I thought we passed the legs off them at the end.
"It's a point that we've got but I am disappointed that we didn't carry that though and get the three. I cannot fault and will never fault the spirit of the team."
Cambridge United manager Jez George told BBC Radio Cambridgeshire:
"We're disappointed obviously that we conceded such a late goal but we have to be thankful we got a point. We have got to learn from it and be better but at least we have something on the board.
"I thought we were really bright in the first half an hour, I thought our play was good and we looked a decent team.
"But it was too easy for them as the game went on to throw everything at us and we became a 'sit in and defend' team rather than getting hold of the ball and trying to create problems for them on the break.
"It was disappointing for everybody that they scored so late but it wasn't the worst result we could have got and we need to build on that for the next game."
Live Text Commentary
Full Time The referee signals the end of the game.90:00 +3:23
Reece Styche fouled by Josh Coulson, the ref awards a free kick. Ben Wright crosses the ball from the free kick right-footed from right wing, Josh Coulson manages to make a clearance.90:00 +0:40
Reece Styche delivers the ball.89:10 Goal scored
Goal! - Yan Klukowski - Forest Grn 1 - 1 Cambridge Placed penalty scored by Yan Klukowski. Forest Green 1-1 Cambridge Utd.88:22 Booking
Booking The referee shows Kevin Roberts a yellow card for unsporting behaviour.88:08
Foul by Kevin Roberts on James Norwood, Penalty awarded.87:19
Corner from right by-line taken by Ben Wright.86:57
The ball is sent over by Eddie Oshodi, blocked by Liam Hughes.85:45
Ed Asafu-Adjaye delivers the ball, clearance by Josh Coulson.85:15
Adriano Moke crosses the ball.82:16
The ball is crossed by Ricky Wellard, save by Sam Russell.77:55 Substitution
Substitution Reece Styche is brought on as a substitute for Matty Taylor.76:47
Free kick awarded for a foul by Ben Wright on Sam Smith. Jonathan Hedge restarts play with the free kick.76:25
Sam Smith concedes a free kick for a foul on Eddie Oshodi. James Rowe restarts play with the free kick.76:00
Outswinging corner taken by Rossi Jarvis from the right by-line, Jamie Collins makes a clearance.74:43
Free kick awarded for a foul by Jamie Turley on Sam Smith. Free kick crossed by Rossi Jarvis, clearance made by Jamie Collins.74:19
The referee blows for offside. Free kick taken by Jonathan Hedge.73:48
The ball is sent over by James Rowe, clearance by Josh Coulson.73:33
Ben Wright sends in a cross, Josh Coulson manages to make a clearance.71:04 Substitution
Substitution Sam Smith replaces Tom Elliott.
Tom Elliott challenges Jamie Collins unfairly and gives away a free kick. Sam Russell takes the free kick.69:19 Substitution
Substitution Magno Vieira leaves the field to be replaced by Ben Wright.68:45
Eddie Oshodi sends in a cross, Ed Asafu-Adjaye has an effort at goal from just outside the box which goes wide of the right-hand upright.65:22 Booking
Booking Booking for Robbie Willmott.65:05
Robbie Willmott gives away a free kick for an unfair challenge on Eddie Oshodi. Indirect free kick taken by Sam Russell.64:16
James Norwood crosses the ball, Josh Coulson makes a clearance.62:49 Substitution
Substitution Harrison Dunk goes off and Adriano Moke comes on.62:09
The ball is crossed by Ed Asafu-Adjaye.60:38
Corner taken right-footed by James Rowe, Scott Garner makes a clearance.60:15
The ball is crossed by Jamie Turley, clearance by Kevin Roberts.59:40
Outswinging corner taken right-footed by James Rowe, Josh Coulson makes a clearance.59:01
The ball is crossed by Yan Klukowski, blocked by Harrison Dunk.57:48
A cross is delivered by James Rowe, clearance by Scott Garner.57:08
Corner taken by James Rowe from the left by-line to the near post, Ricky Wellard makes a clearance.56:44
Corner taken by James Rowe played to the near post, Kevin Roberts manages to make a clearance.56:28
A cross is delivered by Matty Taylor, Kevin Roberts makes a clearance.55:37
Free kick awarded for an unfair challenge on Ed Asafu-Adjaye by Robbie Willmott. Sam Russell takes the indirect free kick.54:51
Robbie Willmott sends in a cross, save by Sam Russell.53:35
James Norwood delivers the ball.53:17
The referee penalises Harrison Dunk for handball. Eddie Oshodi takes the direct free kick.50:06
James Norwood crosses the ball, Ricky Wellard manages to make a clearance. Corner taken right-footed by James Rowe to the near post, Tom Elliott manages to make a clearance.48:23
Yan Klukowski is ruled offside. Jonathan Hedge restarts play with the free kick.47:36
Magno Vieira is penalised for handball and concedes a free kick. Kevin Roberts restarts play with the free kick.46:38
A cross is delivered by Robbie Willmott, clearance made by Eddie Oshodi.46:15
Centre by Eddie Oshodi, save by Jonathan Hedge.45:01
The referee starts the second half.45:01 Substitution
Substitution James Rowe on for Alhassan Bangura.45:00 +2:30 Half time
Half Time The ref blows to signal half-time.45:00 +1:38
Inswinging corner taken by Yan Klukowski from the right by-line, clearance by Tom Elliott.45:00 +1:13
Shot by Matty Taylor. Blocked by Rossi Jarvis.45:00 +0:38
The ball is sent over by Eddie Oshodi, Kevin Roberts makes a clearance.43:56
Keiron Forbes has an effort at goal from just outside the box which goes wide of the right-hand upright.43:36
The ball is sent over by Keiron Forbes, Jonathan Hedge makes a save.41:37
James Norwood sends in a cross, Headed effort from inside the box by Yan Klukowski misses to the right of the target.39:14
The referee blows for offside. Jonathan Hedge restarts play with the free kick.37:29
Outswinging corner taken right-footed by Yan Klukowski, Harrison Dunk makes a clearance.37:12
James Norwood sends in a cross, Harrison Dunk manages to make a clearance.35:46
Inswinging corner taken by Yan Klukowski from the right by-line, Jonathan Hedge manages to make a clearance.34:54
The ball is sent over by Magno Vieira, James Norwood takes a shot. Save by Jonathan Hedge.32:27
Josh Coulson provided the assist for the goal.32:27 Goal scored
Goal! - Tom Elliott - Forest Grn 0 - 1 Cambridge Tom Elliott finds the back of the net with a headed goal from close in. Forest Green 0-1 Cambridge Utd.32:14
Josh Coulson crosses the ball,31:01
Free kick awarded for an unfair challenge on Robbie Willmott by James Norwood. Kevin Roberts crosses the ball in from the free kick, clearance by Jamie Turley.29:45
Unfair challenge on Keiron Forbes by Ricky Wellard results in a free kick. Yan Klukowski crosses the ball in from the free kick.25:45
Kevin Roberts sends in a cross, save by Sam Russell.25:45 Substitution
Substitution Liam Hughes comes on in place of Luke Berry.25:45
Foul by Yan Klukowski on Tom Elliott, free kick awarded. Ricky Wellard restarts play with the free kick.21:54
The ball is swung over by Ricky Wellard.19:03
The ball is delivered by Yan Klukowski, save made by Jonathan Hedge.17:15
The ball is delivered by Robbie Willmott.15:54
Yan Klukowski produces a cross.15:17
Shot from just outside the penalty area by Robbie Willmott misses to the left of the target.13:16
A cross is delivered by Magno Vieira.12:16
Jamie Turley sends in a cross, save by Jonathan Hedge.10:31
Outswinging corner taken by Rossi Jarvis from the right by-line.10:18
Robbie Willmott delivers the ball, clearance made by Eddie Oshodi.10:01
The ball is sent over by Ricky Wellard, Jamie Turley manages to make a clearance.9:09
Ed Asafu-Adjaye gives away a free kick for an unfair challenge on Josh Coulson. James Jennings takes the indirect free kick.7:22
Yan Klukowski takes a shot from just outside the penalty area clears the crossbar.6:39
Headed effort on goal by Robbie Willmott from inside the penalty box misses to the right of the target.6:06
Luke Berry crosses the ball, clearance made by Ed Asafu-Adjaye.5:32
Eddie Oshodi challenges Kevin Roberts unfairly and gives away a free kick. Free kick taken by Jonathan Hedge.4:25
Foul by Robbie Willmott on Eddie Oshodi, free kick awarded. Sam Russell takes the indirect free kick.0:10
Luke Berry gives away a free kick for an unfair challenge on Keiron Forbes. Free kick crossed right-footed by Yan Klukowski, clearance made by James Jennings.0:00
The match begins.
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