A major internet blackout that hit many high-profile websites on Tuesday has been blamed on a software bug.
Fastly, the cloud-computing company responsible for the issues, said the bug had been triggered when one of its customers had changed their settings.
The outage has raised questions about relying on a handful of companies to run the vast infrastructure that underpins the internet.
Fastly apologised and said the problem should have been anticipated.
The outage, which lasted about an hour, hit some popular websites such as Amazon, Reddit, the Guardian and the New York Times.
The company has deployed a bug fix across its network and promised a "post mortem of the processes and practices we followed during this incident" and to "figure out why we didn't detect the bug during our software quality assurance and testing processes".
Another global internet outage hits major banks, airlines
An hour-long blackout struck several US airlines, Australian financial firms and other global companies, with the problem traced to US-based tech provider Akamai.
Major banks and airlines were among businesses that have been hit by a fresh global online outage, with the problem traced to US-based tech provider Akamai.
An hour-long blackout hit a number of US airlines and several Australian financial firms as well as other companies dotted around the world, with angry customers unable to access websites and mobile apps.
"We are aware of the issue and actively working to restore services as soon as possible," an Akamai spokesperson told AFP.
American, Delta, United and Southwest airlines were among those affected, while the issue appeared to be more prolonged in Australia — where problems struck mid-afternoon as much of the world slept.
Australia's largest financial firm Commonwealth Bank told AFP that it and many of the country's major lenders had been hit.
The outages, which began around 2:10pm Sydney time (0510 GMT), also hit Australia's postal service and Virgin Australia.
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