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Quickly, the company behind a major global internet outage this week said on Wednesday the incident was caused by a bug in its software that triggered when one of its customers changed its settings.
Tuesday’s outage raised questions about the internet’s dependence on a few infrastructure companies. The Fastlys problem wiped out high-traffic sites, including news providers such as The Guardian and New York Times, as well as UK government sites, Reddit, and Amazon.com.
This outage was large and serious, and we are truly sorry for the impact on our customers and all those who rely on them, the company said in a blog post written by Nick Rockwell, its senior director of engineering and infrastructure.
He said the problem should have been anticipated.
Fastly operates a group of strategically placed servers around the world to help customers move and store content near their end users quickly and securely.
The company’s post gave a timeline of events and promised to examine and explain why Fastly failed to find the software bug during its own testing process.
Fastly said the bug was in a software update sent to customers on May 12, but it was not triggered until an unidentified customer changed the settings that triggered the issue, which caused 85% of our network to return errors.
Quickly noticed the failure within a minute, it occurred at 09:47 GMT, and engineers determined the cause at 10:27 GMT. Once they disabled the settings that triggered the problem, most of the company’s network quickly recovered.
In less than 49 minutes, 95% of our network was functioning normally, the company said.
Its networks were fully recovered at 12:35 GMT and it began rolling out a permanent software patch at 5:25 GMT, Fastly said.
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