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.
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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."
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