Champions Connacht bag a bonus-point win as Pro12 leaders Ulster fall to their first defeat.
Munster move level on points with second-placed Ulster in the Pro12 table thanks to a bonus-point win over Connacht.
Ulster stay on course for a Pro12 play-offs place and dent Connacht's European qualification hopes by winning in Galway.
Pro12 leaders Ulster make it five wins out of five as Ospreys suffer their second successive defeat.
Ulster boost their hopes of a place in the Pro12 play-offs as they end the six-match winning run of leaders Connacht in a bruising Kingspan Stadium contest.