Jochen Hecht also scored for the Sabres, who never trailed while snapping the Penguins' seven-game winning streak.
Iginla was set to play his second game for the Penguins on Tuesday night as they looked for their 16th straight win against Buffalo.
It could soon be worse for Fleury, who might be the backup goalie when the Penguins host the Islanders in Game 5 of the first-round series on Thursday night in Pittsburgh.
The Penguins sold out every home game since 2007.
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Notes: Saturday's game between the Pittsburgh Penguins and Buffalo Sabres was moved to 7:30 p.m.
It didn't matter much to the Pittsburgh Penguins during their perfect 15-game run through March.
Friday's game between the Pittsburgh Penguins and Boston Bruins was postponed and tentatively rescheduled for 12:30 p.m.
The Rangers moved into seventh place in the tight Eastern Conference playoff race and pushed the Atlantic Division-leading Penguins to the limit in a game that had a postseason feel.
Instead Porter scored the first goal allowed by the Penguins in 218:48 of game time following a bizarre sequence in which Iginla broke his stick trying a slap shot from the point, leading to a breakout by the Sabres.
Okposo clicked on a line that included center Frans Nielsen and left wing Josh Bailey, another first-round draft choice, and he was even better after Islanders coach Jack Capuano switched Bailey and Matt Moulson for Game 2 against the Penguins.
Every game figured to be as lopsided as Game 1, which the Penguins won, 5-0.
Another 60 minutes like the Penguins put together on Thursday and a Game 7 won't be required.
Pittsburgh spent most of the first half of the season on the road but Sunday started a 12-game run in which the Penguins will play only twice away from home.
Jokinen beat Henrik Lundqvist with a wrist shot 32 seconds into the third period, and then one of the NHL's top shootout specialists slipped a wrister over the New York goalie in the first round of the tiebreaker as the Penguins snapped out of a two-game funk that came on the heels of a 15-game winning streak.
Yet it's something the Penguins are sure to expect again heading into Game 2 on Monday night.
The Penguins beat the Islanders 4-0 in Game 5 to take a 3-2 lead in the best-of-seven series.
Saturday night's originally scheduled game between the Buffalo Sabres and Penguins in Pittsburgh was rescheduled for Tuesday night.
The Penguins are averaging more than four goals a game in playoffs, a full goal more than any other team.
Keep it going for another three periods in Game 2 on Friday and the Penguins will have a commanding 2-0 lead.
Coach Dan Bylsma stressed the importance of personal responsibility and during a 15-game winning streak in March the Penguins looked like they'd finally learned their lesson, posting three consecutive shutouts at one point.
But the Islanders had to sit on the lead for more than 17 minutes to win the game, an eternity against the talented Penguins.
Crosby's eye-popping goal provided the exclamation point in a 4-0 win in Game 5 on Thursday night as the Penguins took a 3-2 series lead.
Lundqvist took a shutout bid into the third period one night after he made 26 saves in a shootout loss to the Penguins that had all the intensity of a playoff game.
Wearing a plastic protector designed to make him more comfortable, Crosby scored twice in the game's first eight minutes and the Penguins raced to a quick 3-1 lead.
While we were at the booth we loaded up a simple game, and used the pen to control the penguins on the ice, much like flicking angry birds on a phone.
The Penguins had rallied from a deficit four times during their 15-game run.
The Islanders were just 5:16 away from sending the series back to Pittsburgh for one more game when another defenseman, Paul Martin, got the Penguins even for the third time.
The NHL game at TD Garden between the Bruins and the Pittsburgh Penguins, two of the top four teams in the Eastern Conference, was tentatively rescheduled for Saturday at 12:30 p.m.
Not that the Penguins are a bad team--Jaromir Jagr is one of the game's best scorers.
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