Amazon AWS: Some EC2 instances experienced connection issues, now restored to normal

News on April 15th, Amazon AWS released an update stating that between 12:40 and 1:43 Pacific Time, some EC2 instances in a single availability zone (apne1-az4) located in the Asia-Pacific Northeast-1 region (AP-NORTHEAST-1) experienced connection issues. The problem originated from simultaneous interruptions of the main power supply and backup power supply, affecting the normal operation of related EC2 instances. During this period, customers may encounter higher error rates and delays on instances launched within the affected area, and some other AWS APIs dependent on these EC2 instances may also be affected. Our engineers intervened automatically within minutes and immediately began investigating and implementing corrective measures. We do not believe this issue will occur again. Currently only a very small number of instances are still deployed on hardware affected by the power outage. Efforts will continue to restore all affected instances and volumes, but for immediate recovery, it is recommended to replace these yet-to-be-recovered instances or storage volumes as much as possible. This issue has now been resolved with services back to normal operation.