All posts in: "Outage Reports"

AWS S3 Outage Likely Caused by Internal Network Issue

Posted by on February 28, 2017

On Tuesday, February 28th, 2017, the US-East-1 region of Amazon Web Services S3 saw a complete outage from 9:40am to 12:36pm PST. AWS S3 (Simple Storage Service) is a cloud object storage solution that many services rely on to store and retrieve files from anywhere on the web. In addition, many other AWS services that depend on S3 – Elastic Load Balancers, Redshift data warehouse, Relational Database Service and others – also had limited to no functionality. … Read More »

Top Internet Outages of 2016

Posted by on December 20, 2016

As we sip on warm holiday beverages and gradually wind down the year, it’s rather customary to reflect on the past and contemplate the future. Following traditions, we took a stroll down memory lane analyzing the state of the Internet and the “cloud”. In today’s blog post we discuss some of the most impactful outages of 2016, understand common trends and evaluate some of the key learnings.… Read More »

Connecting the Dots: Web Performance and 3rd-Party Scripts

Posted by on October 26, 2016

As explained in our recent blog post, The DDoS Attack on Dyn’s DNS Infrastructure, a large-scale DDoS attack took down a good chunk of the Internet on the morning of Friday, October 21st. It was a very busy morning for anyone involved with website reliability and network operations in any of the hundreds of businesses that were, in one way or another, impacted by the outage.… Read More »

The DDoS Attack on Dyn’s DNS Infrastructure

Posted by on October 25, 2016

On Friday, October 21st, a series of large-scale DDoS attacks were launched against Dyn, a managed DNS provider. Over the course of 18 hours, these attacks disrupted many critical services–including Spotify, Amazon and HBO Now–all of whom are customers of Dyn. At the height of the attack, approximately 75% of our global vantage points sent queries that went unanswered by Dyn’s servers.… Read More »

Pokémon GO Experiences Network and Application Outages

Posted by on July 28, 2016

On July 6, 2016, Pokémon GO, the augmented reality gaming phenomenon, launched in the United States, and millions became Pokémon trainers with the dream to “catch’ em all.” By July 7, Pokémon GO was the most downloaded and top-grossing game in the United States. At the time of this writing, the GPS-based game had generated $35 million in revenue from 30 million downloads. … Read More »

DDoS Attack Has Varying Impacts on DNS Root Servers

Posted by on July 19, 2016

On June 25, 2016, all 13 DNS root servers suffered from a major distributed denial-of-service (DDoS) attack. This wasn’t the first time in recent memory that attacks were aimed at critical DNS infrastructure — at the end of last year, several root servers came under a DDoS attack, and in mid-May NS1 also experienced a DDoS attack that brought down services like Yelp and Alexa. … Read More »

How to Analyze a DDoS Attack on DNS Infrastructure

Posted by on June 23, 2016

On May 16th, 2016, NS1, a DNS and traffic management vendor, was a victim of a widespread DDoS attack that affected a number of prominent websites and services, including Yelp and Alexa. The DDoS attack was broadly targeted at NS1, affecting their DNS infrastructure, the hosting provider of their website and other online-facing assets.… Read More »

SEA-ME-WE-4 Cable Fault Has Ripple Effects Across Networks

Posted by on May 20, 2016

On May 17th 2016, we started seeing a string of network and BGP routing issues that were spread across continents. A deeper look revealed correlated behaviour resulting from possible mishaps in the SEA-ME-WE 4 (SMW-4) submarine communications cable affecting Tata Communications and Telecom Italia Sparkle (TISparkle).… Read More »

The Ongoing War Between China’s Great Firewall and Circumvention Tools

Posted by on May 11, 2016

In previous posts, we’ve explored many of the pieces that make up China’s vast system of censorship, including the Great Firewall, a huge content-filtering machine, and the Great Cannon, a powerful new DDoS weapon. But that’s just one side of the story—just as Chinese censorship has evolved over time, so too have the methods to evade it. … Read More »

Trans-Atlantic Issues in the Level 3 Network

Posted by on May 9, 2016

Beginning at 10:55pm Pacific on May 3, 2016, the Level 3 network experienced severe network issues across several coastal locations in the U.S. and the U.K. The incident was mentioned on the Outages mailing list at, and by the time the issues ended around 12:05am over an hour later, a long list of services had been affected, including Cisco, Salesforce, SAP SuccessFactors, Viacom and New York Life.… Read More »