Amazon Web Services is back up after a massive outage that hit sites including Roku, Adobe, and Target-owned Shipt

Amazon Web Services (AWS) is back up after being down for most of Wednesday.

"We have restored all traffic to Kinesis Data Streams via all endpoints and it is now operating normally," the company said early Thursday morning.

Scores of websites rely on the internet infrastructure to function. The outage only affected one of AWS's 24 regions, its US-East-1 Region, but it took down many popular web-based services that utilize its servers, like Roku, Flickr, and Adobe Spark, which were among those that have reported issues. The Verge first reported the outage.

Amazon said it had identified the root cause of the outage late Wednesday night, and said it had "completed immediate actions to prevent recurrence."

Down Detector reported more than 1,000 users experiencing problems with the service, which is a massive aspect of Amazon's business. AWS reported $11.6 billion in revenue for Q3 of this year and accounted for more than $3.5 billion of Amazon's $6.2 billion in operating income for the same quarter.

AWS has seen an increase in demand during the pandemic as office workers take to their homes to work remotely and rely more heavily on virtual conferencing software and other office tools. 

David Brown, vice president of AWS Elastic Compute Cloud, told Business Insider's Ashley Stewart in May that it has avoided capacity issues and outages during the pandemic because it began adapting its supply chain in January in response to the health crisis.

"We're working very, very hard behind the scenes to create the illusion of infinite capacity," Brown said.