It said there was an "issue" with late phone and online bookings amid "unprecedented demand" to watch British boxer David Haye take on Wladimir Klitschko.
The glitch meant many fans were unable to order the ?14.95 pay-per-view fight.
Haye lost on points to Klitschko, and blamed the loss on a broken toe.
During the fight, Sky's Twitter feed urged those experiencing problems to "please find your nearest pub".
Viewers were still able to purchase by using their remote controls, as there were no issues with that method, Sky said.
A statement on the Sky website after the fight said: "We are sorry to have disappointed any viewers who were unable to order Haye vs Klitschko tonight. Sky had an issue during the evening with new telephone and online bookings for the fight.
"We had encouraged early booking over three weeks leading up to the fight, through a range of media including on-air promos and press advertising.
"However, we experienced unprecedented demand on the night and whilst early telephone and online purchases worked there were issues with late bookings through these routes on Saturday."
Sky is replaying the fight at no charge to customers at 0900 BST, 1300 BST and 1900 BST on Sunday.
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