Dozens of websites in the U.S. and Europe flicked back on after being offline for roughly an hour early Tuesday, following an internal glitch at a major cloud-services provider.

Sites including the U.K. government’s main public-services portal and several major U.S. and European news outlets, such as the New York Times and Le Monde, were inaccessible to at least some users for about an hour, beginning around 6 a.m. Eastern Time.

Fastly Inc., the operator of a content-delivery network service that many websites use to help speed the loading of their webpages for users, appears to have been at the root of the problems. Shortly before 7 a.m., the company said it had applied a fix to a service configuration problem, and websites began to come back online.

Joshua Bixby, Fastly’s chief executive, reached in the middle of the outage, said the company was investigating the issue, but that it wasn’t attack-related.

“We’re remediating as we speak,” he said. He declined to comment on whether the problems with Fastly’s service were directly related to the websites that were down, but said the company would provide an update.