Crossref incident

Cloudflare network problems affecting DOI.org resolution

Major Resolved View vendor source →

Crossref experienced a major incident on November 18, 2025 affecting Handle servers, lasting 7h 10m. The incident has been resolved; the full update timeline is below.

Started
Nov 18, 2025, 12:51 PM UTC
Resolved
Nov 18, 2025, 08:01 PM UTC
Duration
7h 10m
Detected by Pingoru
Nov 18, 2025, 12:51 PM UTC

Affected components

Handle servers

Update timeline

  1. investigating Nov 18, 2025, 12:51 PM UTC

    Cloudflare network problems are affecting multiple sites, including doi.org resolution, meaning many DOI links are very slow or result in errors. https://www.cloudflarestatus.com/incidents/8gmgl950y3h7

  2. investigating Nov 18, 2025, 01:12 PM UTC

    The DOI Foundation is also aware: https://doi.statuspage.io/incidents/z0rwt8tqcfsm

  3. resolved Nov 18, 2025, 08:01 PM UTC

    Clouflare reports that the issues are fixed, and DOIF subsequently reports that doi.org resolutions have returned to normal.

  4. postmortem Nov 20, 2025, 08:22 PM UTC

    CNRI has written a postmorterm about how they handled the Cloudflare outage for doi.org: [https://doi.statuspage.io/incidents/z0rwt8tqcfsm](https://doi.statuspage.io/incidents/z0rwt8tqcfsm)