Lisandro could have doubled Porto's lead but saw his strike saved by Van der Sar before United were gifted an equaliser courtesy of Bruno Alves's woeful back pass.
Rooney could hardly believe his luck as he beat Porto goalkeeper Helton with a calm finish after 15 minutes.
Despite their setback Porto continued to threaten through the impressive Hulk and Rodriguez.
Van der Sar denied both players with impressive saves while Lisandro saw his deflected shot tipped wide by the Dutchman as the visitors went in search of a deserved second goal.
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