Portadown struck in the closing moments to earn a point from this visit to Inver Park to face Larne.
The game got off to a blistering start with three goals inside the opening 20 minutes.
Ben Guy edged the visitors in front on six minutes with a simple tap-in after a defensive mix-up between Conor Devlin and Graham Kelly.
But Larne levelled just a couple of minutes later through new signing Dylan Mottley-Henry who knocked home the rebound after Mark Randall's initial effort was pushed out by Jacob Carney.
Mottley-Henry then turned provider on 19 minutes after showing great pace down the right before sending the ball across the face of goal for Ronan Hale to slot home.
Inevitably things quietened down after this, although Larne might have extended their lead late in the first half when Martin Donnelly crossed for Hale but his header fell just wide while, not long after the break, Mottley-Henry had a chance in a crowded box but his shot was straight at Carney.
Hale had a chance early in the second half but Carney did well to turn the effort away, just before Greg Hall was on hand to clear a Donnelly shot off the line.
Larne had further chances through Mottley-Henry and substitute Conor McKendry but, with a minute remaining, the Ports levelled through Lee Bonis after he was first to the ball to nod it past Devlin to earn a point for Matt Tipton's side.