Amazon Web Services, a leader in the cloud infrastructure market, reported a major outage on Monday, taking down numerous major websites.
Many sites came back online within a few hours, although Downdetector showed another spike in user reports around noon ET of outages at Amazon, AWS and Alexa.
Around 11 a.m. ET, AWS said it was working to identify the "root cause" for the network connectivity issues impacting some of its services.
"We have identified that the issue originated from within the EC2 internal network," the company wrote, referring to its popular cloud service that provides virtual server capacity. "We continue to investigate and identify migrations."
The outage was first reported at 3:11 a.m. ET in AWS' main US-East-1 region hosted in northern Virginia. A notice on AWS' status page said it was experiencing DNS problems with DynamoDB, its database service that underpins many other AWS applications.
DNS, or Domain Name System, translates website names to IP addresses so browsers and other applications can load.
AWS cited an "operational issue" affecting "multiple services" and said it was "working on multiple parallel paths to accelerate recovery," in an update at 5:01 a.m. ET. More than 70 of its own services were affected.
Shortly afterward, AWS said it was seeing "significant signs of recovery."
AWS said in an update at 6:35 a.m. ET that the DNS issue had been "fully mitigated" and that AWS service operations were "succeeding normally."
AWS is the leading provider of cloud infrastructure technology, accounting for around a third of the market, ahead of Microsoft and Google, according to Synergy Research Group. Millions of companies and organizations rely on AWS for cloud computing services, such as servers and storage.