Incident Library
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Cases2 cases

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  1. IL-0260 zoom.us stopped resolving for about two hours after GoDaddy Registry placed a server block on the domain
    Zoom2025
    Symptoms

    On 16 April 2025 customers in the US and International regions could not reach Zoom services because lookups of the zoom.us domain failed. Starting, joining or scheduling a meeting needs a DNS lookup, so none of those actions completed; people already in a Zoom meeting or on a Zoom Phone call were not affected.

    DNS resolution failuresService outage
    Trigger

    A communication error between Zoom's domain registrar, Markmonitor, and GoDaddy Registry led GoDaddy Registry to place a server block on zoom.us by mistake, which shut the domain down.

    Root cause
    Dependency failure
    Component
    Authoritative DNS servers and records
    Contributing factor
    No safeguard on destructive change
    Remediation
    • Identified and removed the server block on zoom.us together with Markmonitor and GoDaddy
    • Asked users who still had connection problems to flush their DNS cache and reconnect
    Action items
    • Put a registry lock on zoom.us that restricts server block commands on the domain
    • Implement additional technical changes and processes with GoDaddy Registry and Markmonitor so the issue does not recur
    View case
  2. IL-0269 Octez Connect services went down for hours when its only DNS provider failed and the nodes' records stopped resolving
    Octez Connect2025
    Symptoms

    On 5 February 2025 at 04:34 the monitoring system flagged DNS resolution problems on the first Octez Connect node and raised a Pager Duty alert. Every server that relied on the same DNS provider went down, and users could not reach the services until the provider restored DNS.

    DNS resolution failuresService outage
    Trigger

    An outage at Octez Connect's DNS provider, metanet.ch, stopped the DNS records of its nodes from resolving.

    Root cause
    Dependency failure
    Component
    Authoritative DNS servers and records
    Contributing factor
    Single point of failureLimited debug access
    Detection

    The monitoring system flagged DNS resolution problems on the first node at 04:34 and raised a Pager Duty alert.

    Remediation
    • Escalated the DNS resolution alert through Pager Duty
    • Confirmed the provider's outage by repeatedly calling its hotline and watching its status page
    • Emailed the provider's support, which replied at 08:20 that it was looking into the issue
    • Tested DNS resolution and confirmed that DNS had been restarted
    • Posted a public update on Slack and Twitter announcing the recovery
    Action items
    • Configure a second DNS provider alongside the first
    • Build a public status page for real-time outage information
    • Review and improve internal escalation procedures for third-party outages
    Lessons

    Relying on a single DNS provider made it a single point of failure that brought down every connected service, and the provider's outage also slowed communication with it, which lengthened the downtime. Octez Connect concluded that it needs redundant DNS providers.

    View case
Check your cluster for this

These 2 cases involve Authoritative DNS servers and records. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Dependency failure2 cases

Component
Authoritative DNS servers and records2
Contributing factor
Limited debug access1No safeguard on destructive change1Single point of failure1
Organisation
Octez Connect1Zoom1
  1. IL-0260 zoom.us stopped resolving for about two hours after GoDaddy Registry placed a server block on the domain
    Zoom2025
  2. IL-0269 Octez Connect services went down for hours when its only DNS provider failed and the nodes' records stopped resolving
    Octez Connect2025