Hours of problems struck services like Q&A forum Quora, and Giphy, an image hosting service.
The sites rely on hosting provided by Amazon Web Services (AWS) - a cloud computing provider.
A typo made during a routine debugging of the AWS billing system caused the failure.
"Unfortunately,
one of the inputs to the command was entered incorrectly and a larger
set of servers was removed than intended," Amazon said in an online
statement.
The error required a full restart that "took longer than expected".
Around 150,000 websites and services rely on AWS.
Among those affected by the failure was - somewhat ironically - Down Detector, a service that tracks downtime at major websites.
Amazon,
which is the world's largest provider of cloud services, says it is now
making changes to help prevent a similar incident occurring in the
future.
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