Leinster Rugby had their hopes of progression in the Guinness PRO14 Rainbow Cup extinguished by hosts Glasgow Warriors at Scotstoun Stadium.

Leo Cullen’s men came into this one knowing nothing less than five points would do. Instead, they came away with just a losing bonus point from a three-point defeat.

Leinster were keen to use the first half wind to their advantage, Ross Byrne’s boot astutely moving them down the field.

Rónan Kelleher was the fulcrum of a move in which Garry Ringrose’s pass to Cian Kelleher was a touch forward, according to referee Frank Murphy.

Ringrose’s thunderous tackle into Cole Forbes and an aggressive defence forced George Horne into kicking the ball away.

A Glasgow lineout well inside the 22 and back-to-back penalties led to a warning from the referee and a five-metre lineout.

Leinster’s crew was ready for a quick throw to the front and a series of drives, Matt Fagerson eventually breaching the line for Ross Thompson to convert in the 13th minute.

The reaction was solid, Byrne’s patience in finding runners on his shoulder rewarded, Ross Molony breaking the line for the offload to Rory O’Loughlin.

The quick ruck ball didn’t allow Glasgow to reset their defence, Caelan Doris pirouetting away from a tackler and Luke McGrath sniping smartly for a try under the posts.

Full-back Adam Hastings’ kick and chase applied enough pressure to force a spill out of McGrath, prompting a set move which was undone by heavy Leinster tackling.

In response, a smattering of pick-and-jams was not good enough to skewer Glasgow, the ball whipped right for Hugo Keenan’s footwork to do the trick.

But, the video evidence of a Ross Molony knock-on in the lead-up was strong enough to rub out the score.

Glasgow were still on the backfoot, Horne’s exit kick not enough to clear the 22. James Ryan just couldn’t grab Kelleher’s throw at the lineout.

Once again, out-half Byrne squeezed a kick inside the 22 and Keenan’s smart play almost put Cian Kelleher away up the left with Forbes in the bin.

The determination of Josh van der Flier and Josh Murphy to stay on their feet gave the visitors momentum, O’Loughlin’s release of the pass allowing Cian Kelleher to step inside Horne and reach for the line for 12-7 on the half-hour.

Centre O’Loughlin was binned for no clear release at a ruck before Glasgow were penalised for crossing to signal half-time.

On resumption, the familiar theme of Horne’s exit putting the ball into the hands of Cian Kelleher sparked a Leinster assault, Ross Byrne’s trickling kick testing Hastings.

Van der Flier was alive to Steyn’s disguised line of running in snuffing out a launch play.

Ringrose was twice involved in taking the Blues out of trouble, flanker Murphy marching forward and McGrath kicking in behind the defence.

Andrew Porter’s first carry was good for 10 metres and a flurry of passes concluded with Keenan taking Ryan’s fine pass for what turned into a second disallowed try, resulting from Porter’s obstruction.

Immediately, Glasgow moved with menace, slick off-loads from out-half Thompson and Hastings  – it looked decidedly forward – putting Steyn beyond Cian Kelleher for the equaliser in the 49th minute.

An inaccurate lineout throw by Fraser Brown was seized upon by Rónan Kelleher for a quick gain of 15 metres.

Tom Gordon’s smash on Ed Byrne did not stifle Leinster’s continuity, but Keenan diving onto Hastings on the ground did concede a penalty.

The Blues front row with Porter and Peter Dooley in as reinforcements, powered up a scrum penalty only for them to give away their position with an undisciplined lineout drive.

They were soon asked to defend, O’Loughlin and Ryan Baird applying pressure only for the Leinster rearguard to cough up an opportunity for a shot at goal.

This time, Thompson arrowed a penalty from close to 40 metres for 15-12 in the 65th minute.

From there, the carries came thick and fast until Ross Byrne lost the ball forward in what was their last meaningful attack.

Back and forth it went, neither side able to sustain enough pressure to make it count. It required a sure tackle from Dan Sheehan to stop  Horne in his tracks.

Leinster were able to withstand an all-out attack. They had a long way to go when eventually winning the ball back with one minute on the clock.

The game ended with one final knock-on to put an end to Leinster’s plans in the Rainbow Cup.