Widely recognised as problematic for a range of reasons, DNS has come in for increased scrutiny in recent years - DNS lookups are generally unencrypted, since they have to be handled by the network to direct traffic to the right locations - not least in the wake of mass DNS hijacking attacks in 20, covered in some detail by Cisco Talos here and Mandiant here. Use of the Internet relies on translating domain names (like “”) to IP addresses the job of DNS. Slack did not detail the precise nature of the configuration change.Ī quick online check of Slack's DNS propagation shows it relying on 33 different DNS resolvers - from better known organisations like OpenDNS, Google, and Cloudflare, to smaller local ISPs. "We’re grateful to the internet service providers and DNS community members who worked quickly to refresh records around the globe, improving conditions for many impacted users." "In the meantime, we reached out to third-party DNS resolvers to request they refresh the record for the domain, which would resolve the issue for Slack users on that DNS resolver. Because some internet service providers and public resolvers persist records for up to 24 hours as a standard practice, the issue continued for a percentage of users." As a result, some third-party DNS resolvers failed to return records for the domain. As the company noted: "Some third-party DNS resolvers still expected the configuration to exist in our domain. "It's always DNS" goes the old IT chestnut and once again, it was - and it persisted even after Slack rolled back the the configuration change at 10:02am (PT) on September 30. A Slack outage late last week was down to a DNS (Domain Name System) configuration change to the domain, the workplace collaboration software provider has confirmed, blaming "a small number of third-party DNS resolvers did not properly interpret the change, causing some users to be unable to connect to Slack" for the outage, which affected tens of thousands of users globally on September 30.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |