An emotional return to Portman Road for Magpies boss Bobby Robson ended with another blank day for Newcastle United.
A red card for Nolberto Solano for a handling a goalbound from Hernan Hreidersson was the trigger for United's demise.
As the Peruvian headed down the players tunnel the Premiership's leading scorer Marcus Stewart fired the resulting penalty past Shay Given to give all three points to the Suffolk side.
Newcastle's chance were few and far between but they did have the ball in the net through Carl Cort but the goal was harshly ruled out for a push from Gary Speed.
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