Papa Bouba Diop missed the best of several chances to equalise just before half-time and Kanu hit a post from close range following a Matt Taylor free-kick on 65 minutes.
But Pompey´s failure to score at home extended to a sixth Barclays Premier League game.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms