LONDON — Dozens of websites briefly went offline around the globe Tuesday, including CNN, The New York Times, and Britain’s government home page, after an outage at the cloud computing service Fastly, illustrating how vital a small number of behind-the-scenes companies have become to running the internet.
The sites that could not also be reached included some Amazon pages, the Financial Times, Reddit, Twitch, and The Guardian. San Francisco-based Fastly acknowledged a problem just before 6 a.m. 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 another mischief. Still, significant futures markets in the U.S. dipped sharply minutes after the outage, which came a month after a cyberattack forced the shutdown of the most considerable fuel pipeline in the U.S.
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 famous sites. These servers store, or “cache,” content such as images and video in places worldwide 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. Internet 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. He said, “it is serious because Fastly is one of the world’s biggest CDNs, and this was a global outrage.”
Fastly stock jumped more than 6% by midday as investors shrugged off the problem.
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 — instead of a more decentralized array of companies. “Even the biggest and most sophisticated companies experience outages. But they can also recover fairly quickly,” Madory said.
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. At the same time, visits to The New York Times and the U.K. government’s gov. uk site returned an “Error 503 Service Unavailable” message, along with the line “Varnish cache server,” which is a technology that Fastly is built on.
