Websites worldwide back online after brief glitch
Dozens of websites briefly went offline around the globe on Tuesday, including CNN, The New York Times and Britain's government home page, after an outage at the cloud service Fastly.
The sites that could not be reached also included some Amazon pages, the Financial Times, Reddit, Twitch and The Guardian.
San Francisco-based Fastly acknowledged a problem just before 6am Eastern. About an hour later, the company said: "The issue has been identified and a fix has been applied."
Most of the sites soon appeared to be back online.
Fastly said it had identified a service configuration that triggered disruptions, meaning the outage appeared to be caused internally.
Brief internet service outages are not uncommon and are only rarely the result of hacking or other mischief.
Still, major futures markets in the United States dipped sharply minutes after the outage, which came a month after a cyber attack forced the shutdown of the biggest fuel pipeline in the US.
Fastly is a content-delivery network, or CDN. It provides vital but behind-the-scenes cloud computing "edge servers" to many of the web's popular sites.
These servers store, or "cache," content such as images and video in places around the world so that it is closer to users, allowing them to fetch it more quickly and smoothly.
Fastly says its services mean that a European user going to an American website can get the content 200 to 500 milliseconds faster.
Online traffic measurement by Kentik showed that Fastly began to recover from the outage roughly an hour after it struck at mid-morning European time, before most Americans were awake.
"Looks like it is slowly coming back," said Doug Madory, an internet infrastructure expert at Kentik. "It is serious because Fastly is one of the world's biggest CDNs and this was a global outage."
The impact of Fastly's trouble highlights the relative fragility of the internet's architecture given its heavy reliance on Big Tech companies – such as Amazon's AWS cloud services – as opposed to a more decentralized array of companies.
When the outage hit, some visitors trying to access CNN.com got a message that said: "Fastly error: unknown domain: cnn.com."
Attempts to access the Financial Times website turned up a similar message, while visits to The New York Times and United Kingdom government's official website returned an "Error 503 Service Unavailable" message, along with the line "Varnish cache server," which is a technology that Fastly is built on.
Down Detector, which tracks internet outages, posted reports on dozens of sites going down.