External DNS service provider’s global outage.
 

Microsoft released the following statement yesterday:

February 11, 2019 12:45 PM PST

/Windows Update customers were recently affected by a network
infrastructure event caused by an external DNS service provider’s
global outage. A software update to the external provider’s DNS
servers resulted in the distribution of corrupted DNS records that
affected connectivity to the Windows Update service. The DNS records
were restored by January 30, 2019 (00:10 UTC), but downstream effects
continued. We believe the issue to be fully mitigated because the
majority of local Internet Service Providers (ISP) have refreshed
their DNS servers and customer services have been restored. If you are
still encountering download failures, please contact your local ISP. /

/While this was not an issue with Microsoft’s services, we take any
service disruption for our customers seriously. We will work with
partners to better understand this so we can provide higher quality
service in the future even across diverse global network providers./






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