1.1.1.1 public DNS resolver unreachable for 62 minutes
Jul 14, 21:52 UTCJul 14, 22:54 UTC
Duration
1h 2m
Impact
Critical
Root cause
Config change
Cloudflare, 90 days
56 incidents
Affected
1.1.1.1 ResolverGateway DNSGlobal
Lesson: Latent config errors can sit for weeks; progressive deployment and legacy-system cleanup matter as much as the change that finally triggers them.
What happened
A service topology configuration error, introduced weeks earlier with no impact, was triggered by a later change and withdrew the 1.1.1.1 prefixes from Cloudflare data centers. Not an attack or a BGP hijack.
More from Cloudflare
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 2500:03 UTC | Issues with Durable Objects | minor | Ongoing |
| Sep 2420:40 UTC | Intermittent 500 errors for backend services on Replicate | minor | 1h 54m |
| Sep 2417:33 UTC | Delays Starting Cloudflare Workers Builds | minor | 3h 19m |
| Sep 2417:26 UTC | Browser isolation session data sync issues | minor | 5h 11m |
| Sep 2415:20 UTC | Cloudflare Access updates delayed | minor | 3h 5m |
| Sep 2410:22 UTC | Customers using BYOIP can have issues updating their BGP prefixes, including advertising or withdrawing prefixes. | minor | 3m |
Also caused by configuration change
All| Started | Vendor | Incident | Impact | Duration |
|---|---|---|---|---|
| Sep 2423:36 UTC |  Render | Key Value service restartsRender | minor | 0m |
| Sep 2414:08 UTC |  HubSpot | The Salesforce integration is unavailable for some customersHubSpot | none | 7h 18m |
| Sep 2218:20 UTC |  Twilio | Phone Number APIs and Console Were Returning Incorrect 404 ResponsesTwilio | none | 0m |
| Sep 1211:04 UTC |  Slack | Some customers experiencing blurry image previews and download issuesSlack | minor | 8h 56m |
| Sep 1107:18 UTC |  Snowflake | INC20000213Snowflake | critical | 6h 1m |
| Sep 407:34 UTC | Snowflake | INC20000199Snowflake | critical | 2h 36m |
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.