Crossref Outage History

On 31 March, we migrated our test system - test.crossref.org - and brought it into sync with our production admin tool - doi.crossref.org. As a result of that migration, access to some of the test accounts was temporarily lost. In addition, members with notification callbacks enabled in test may have noticed that test callbacks were being misrouted to the endpoints set up for your production callbacks. We have since fixed both issues. If you're a test system user who is experiencing any issues today, do contact us at [email protected] so we can investigate and assist. - IF

From 05:46 UTC on 17 April we experienced a sustained surge of traffic to our website, which was caused by bot activity distributed across multiple IP addresses. The service recovered automatically without intervention after about an hour, and we have since applied tighter rate-limiting to the source. We are also reviewing options to further improve the scalability and resilience of the service going forward.

This incident has been resolved.

The 2026 public data file was stalling during download via Academic Torrents (https://academictorrents.com/details/b5ee0e102689b3e67023dd024694c0f5f124646f) for the last few days due to an issue with the number of available sources. We have addressed the issue and downloads should now be completing with no stalling/delays.

Resolution reports were unavailable from around 02:28 UTC to 09:42 UTC, due to the server running out of memory. We have rebooted the server and the service is now available again.

This incident has been resolved. All affected metadata submissions have now been reprocessed.

Yesterday, we experienced a brief website (www.crossref.org) downtime from 10:05 UTC to 10:24 UTC. This issue was resolved, and a temporary fix was implemented to prevent such spontaneous disruptions while we work on a permanent solution. EA