The outage came just days after Apple's highly anticipated unveiling of the Apple Watch, its entry into the fast-expanding wearable devices sphere. The Apple Store website was shut briefly on Monday, a customary practice ahead of a major event.
A similar outage occurred in early September, according to appleinsider.com.
Apple said its iCloud Mail and iCloud Account & Sign In were also affected until about 9 a.m. ET (1300 GMT).