Luton 0-0 Cambridge
Cambridge lost their place at the top of the Conference Premier after failing to beat Luton Town.
A crowd of 7,517 saw the U's start well, only Mark Tyler's acrobatics in the Hatters' goal stopped Richard Tait drilling home.
Nathan Arnold then went clean through but Tyler made another crucial save.
The hosts rarely tested visiting keeper Chris Maxwell and had Jake Howells to thank when he cleared Tom Champion's late header off the line.
Barnet replaced Cambridge at the summit of non-league after a 3-0 win over Braintree.
VIEWS FROM THE DRESSING ROOM
Luton Town manager John Still told BBC Three Counties Radio:
"It was a very competitive game between two strong teams who cancelled each other out.
"Defensively we've found that click, in midfield we're moving the ball really nicely, and it's just up top that's the issue.
"We're playing well in most areas at the moment but it's just quality in the final third that is the problem and a lot of that is to do with players not being fully fit.
"[Luton striker] Jon Shaw did brilliantly today but he needs a hernia operation, we know that and that's why he had to come off."