Access to some Apple Inc/sservices, including the App Store, iTunes Store, Mac App Store and iBooks Store, remained off line after more than eight hours on Wednesday.
Apple said an internal Domain Name System (DNS) error was the cause for the disruptions, according to CNBC.
"We're working to make all of the services available to customers as soon as possible, and we thank everyone for their patience," CNBC quoted the company as saying.
Many users took to Twitter, using hashtags such as #itunesdown and #appstoresdown, to express their frustration.
"Customers may be unable to make purchases from the App Store, iTunes Store, iBooks Store, or Mac App Store," the company said on its website. A similar outage occurred in early September, according to appleinsider.com.
Apple said on Wednesday that its iCloud Mail and iCloud Account & Sign In were also affected for some time.
The Apple Store was shut briefly on Monday, ahead of the company's highly anticipated unveiling of the Apple Watch.
Apple did not immediately respond to a request for comment on the cause of the outage.
"Service outages happen from time to time and we view this as a very minor event," FBR Capital Markets analyst Daniel Ives told Reuters.
Apple shares were down less than 1 per cent at $123.60 in early afternoon trading.
