Story at a glance

  • Sites like The New York Times, Bloomberg News, Reddit, Amazon, British government websites and others briefly went offline.
  • In a blog post, Fastly’s senior engineering and infrastructure executive Nick Rockwell explained the incident was caused by an unknown software bug prompted by just one unnamed customer.
  • The company said the issue has been resolved.

A huge internet outage that caused some of the world’s most popular websites to go offline Tuesday was triggered by one customer updating their settings, according to the cloud computing services firm Fastly.

Fastly was hit by the outage early Tuesday, causing sites like The New York Times, Bloomberg News, Reddit, Amazon, British government websites and others to briefly go offline. Users reported receive error messages when attempting to visit various websites. 


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In a blog post, Fastly’s senior engineering and infrastructure executive Nick Rockwell explained the incident was caused by an unknown software bug prompted by just one unnamed customer. 

Rockwell gave a timeline of events and said the company should have anticipated the outage. 

“On May 12, we began a software deployment that introduced a bug that could be triggered by a specific customer configuration under specific circumstances,” Rockwell said. 

“Early June 8, a customer pushed a valid configuration change that included the specific circumstances that triggered the bug, which caused 85% of our network to return errors,” he said. 

“We detected the disruption within one minute, then identified and isolated the cause, and disabled the configuration. Within 49 minutes, 95% of our network was operating as normal,” Rockwell added. 

The company said the issue has been resolved. 

Fastly operates a group of servers and data centers distributed around the world that allow for the transfer of assets needed for loading internet content. 


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Published on Jun 09, 2021