Download - DNS issue impacting multiple Microsoft services on April’s fool day (with Bonus content)

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The Backend Engineering Show with Hussein Nasser

Technology

DNS issue impacting multiple Microsoft services on April’s fool day (with Bonus content)

2021-04-04

Download Right click and do "save link as"

Microsoft Had an Outage on April 1st that is caused by DNS surge, let us discuss this. Bonus I’ll also discuss the outage that happened on March 18th cpu 100% utilization

RCA - DNS issue impacting multiple Microsoft services (Tracking ID GVY5-TZZ)

Summary of Impact: Between 21:21 UTC and 22:00 UTC on 1 Apr 2021, Azure DNS experienced a service availability issue. This resulted in customers being unable to resolve domain names for services they use, which resulted in intermittent failures accessing or managing Azure and Microsoft services. Due to the nature of DNS, the impact of the issue was observed across multiple regions. Recovery time varied by service, but the majority of services recovered by 22:30 UTC.

0:00 April/1st Outage - DNS Issue

13:30 March/18th Outage - CPU 100%

RCA

https://status.azure.com/en-us/status/history/

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