A DNS CONFIGURATION BLUNDER has been blamed for an outage that downed Microsoft Azure and 365 offerings.
Microsoft cloud customers throughout the globe this week moaned that they had been not able to connect with a plethora of services for several hours as a result of the DNS borkage.
A range of Microsoft services have been impacted, which include Azure databases, Microsoft 365, Teams, Dynamics, OneDrive, SharePoint Online and Compute services.
Following reviews of the flaw, Microsoft posted an Azure popularity web page update stating: “Customers may additionally revel in intermittent connectivity troubles with Azure and other Microsoft services (inclusive of M365, Dynamics, DevOps, and so on).
“Engineers are investigating DNS resolution troubles affecting network connectivity. Connectivity issues are resulting in a downstream impact to Compute, Storage, and Database services, and some clients can be unable to report aid requests.
“More facts could be supplied as it turns into to be had. Some customers may additionally begin to see restoration.”
After investigating the outage, Microsoft showed that “customers can be unable to get entry to Microsoft 365 services or functions”, including that it had “diagnosed and corrected a DNS configuration problem that prevented users from accessing Microsoft 365 services and features”
“We’ve discovered a boom in success connections and our telemetry indicates that each one offering is convalescing. We’re persevering with to display the environment to validate that provider has been restored.”
The three-hour outage has since come to a quiet, with Microsoft confirming that its engineers have mitigated the problem and that maximum services were recovered.
“Engineers identified the underlying root cause as a nameserver delegation exchange affecting DNS resolution and ensuing in downstream effect to Compute, Storage, App Service, AAD, and SQL Database services,” it stated.
“During the migration of a legacy DNS gadget to Azure DNS, some domains for Microsoft services had been incorrectly up to date. No customer DNS data have been impacted at some stage in this incident, and the supply of Azure DNS remained at one hundred% in the course of the incident. The trouble impacted best records for Microsoft offerings.
“To mitigate, engineers corrected the nameserver delegation trouble. Applications and services that accessed the incorrectly configured domain names can also have cached the wrong records, main to an extended restoration time till their cached records expired.” µ
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